Title: Conceptual Physics Daily 10
1Conceptual PhysicsDaily 10
 Adapted from physicsclassroom.com
2 Which of these is a scientific
 hypothesis?
 a. Atoms are the smallest particle of matter that
exists.  b. Albert Einstein is the greatest scientist of
the twentieth century.  c. The universe is surrounded by a second
universe that cannot be seen.  SCSh7, SCSh7e,SCSh8,SCSh8a
3 Which of these is a scientific
 hypothesis?
 a. Atoms are the smallest particle of matter that
exists.  b. Albert Einstein is the greatest scientist of
the twentieth century.  c. The universe is surrounded by a second
universe that cannot be seen.  SCSh7, SCSh7e,SCSh8,SCSh8a
4 2. To test a scientific hypothesis you would
 Use the results of only the experiment
 that confirm the hypothesis.
 b. Set up an experiment and look at
 the results.
 c. Find the best result and report only
 that result.
 d. Set up many experiments and look
 at the results.
 SCSh7, SCSh7e,SCSh8,SCSh8a
5 2. To test a scientific hypothesis you would
 Use the results of only the experiment
 that confirm the hypothesis.
 b. Set up an experiment and look at
 the results.
 c. Find the best result and report only
 that result.
 d. Set up many experiments and look
 at the results.
 SCSh7, SCSh7e,SCSh8,SCSh8a
6 3. A scientific hypothesis may turn out to be
right or it may turn out to be wrong.  If it is a valid hypothesis, there must be a
test to prove it  a. right
 b. wrong
 SCSh7, SCSh7e,SCSh8,SCSh8a
7 3. A scientific hypothesis may turn out to be
right or it may turn out to be wrong.  If it is a valid hypothesis, there must be a
test to prove it  right
 wrong
 SCSh7, SCSh7e,SCSh8,SCSh8a
8 4. The difference between a hypothesis and a
theory is that a hypothesis is  never true whereas a theory is always true
 true whereas a theory is not true
 never true whereas a theory is sometimes true
 an educated guess whereas a theory has been
tested successfully many times  SCSh7, SCSh7e,SCSh8,SCSh8a
9 4. The difference between a hypothesis and a
theory is that a hypothesis is  never true whereas a theory is always true
 true whereas a theory is not true
 never true whereas a theory is sometimes true
 d. an educated guess whereas a theory has been
tested successfully many times  SCSh7, SCSh7e,SCSh8,SCSh8a
10 5. A scalar quantity has
 only direction
 only magnitude
 both magnitude and direction
 neither magnitude or direction
 SP1b,SP1b,SP1f
11 5. A scalar quantity has
 only direction
 b. only magnitude
 both magnitude and direction
 neither magnitude or direction
 SP1b,SP1b,SP1f
12 6. What is needed to describe a vector quantity?
 only magnitude
 only direction
 both magnitude and direction
 Neither magnitude nor direction
 SP1b,SP1b,SP1f
13 6. What is needed to describe a vector quantity?
 only magnitude
 only direction
 both magnitude and direction
 Neither magnitude nor direction
 SP1b,SP1b,SP1f
14 7. Equilibrium occurs when
 all the forces acting on an object are balanced.
 the sum of the forces equals the sum of the
forces.  the net force on the object is zero.
 the sum of the upward forces equals the sum of
the downward forces.  all of the above.
 SP1b,SP1b,SP1f

15 7. Equilibrium occurs when
 all the forces acting on an object are balanced.
 the sum of the forces equals the sum of the
forces.  the net force on the object is zero.
 the sum of the upward forces equals the sum of
the downward forces.  all of the above.
 SP1b,SP1b,SP1f

16 8. What is the maximum resultant possible when
adding a 3N force and a 5N force?  3N
 5N
 8N
 2N
 15N
 SP1b,SP1b,SP1f
17 8. What is the maximum resultant possible when
adding a 3N force and a 5N force?  3N
 5N
 8N
 2N
 15N
 SP1b,SP1b,SP1f
18 9. What is the minimum resultant possible when
adding a 3N force and a 5N force?  3N
 5N
 8N
 2N
 15N
 SP1b,SP1b,SP1f
19 9. What is the minimum resultant possible when
adding a 3N force and a 5N force?  3N
 5N
 8N
 2N
 15N
 SP1b,SP1b,SP1f
20 10. A barge is being pulled along a canal by two
ropes that make equal angles with the direction
in which the barge points. Assuming the two pulls
on the barge are equal, in what direction does
the barge move?  It oscillates back and forth between the two
banks.  It moves straight forward.
 It moves in the direction of the resultant force
on it.  Both a and b
 Both b and c
SP1b,SP1b,SP1f 
21 10. A barge is being pulled along a canal by two
ropes that make equal angles with the direction
in which the barge points. Assuming the two pulls
on the barge are equal, in what direction does
the barge move?  It oscillates back and forth between the two
banks.  It moves straight forward.
 It moves in the direction of the resultant force
on it.  Both a and b
 Both b and c SP1b,SP1b,SP1f
22 11. The astronomer Copernicus publicly stated in
the 1500s that Earth  a. does not move
 b. revolves around the sun.
 c. is slowing down.
 d. moves in a straight line.
 e. is the center of the solar system.

SP1d
23 11. The astronomer Copernicus publicly stated in
the 1500s that Earth  a. does not move
 b. revolves around the sun.
 c. is slowing down.
 d. moves in a straight line.
 e. is the center of the solar system.

SP1d
24 12.The law of inertia applies to
 a. objects at rest.
 b. moving objects.
 c. both moving and nonmoving objects.


SP1d
25 12.The law of inertia applies to
 a. objects at rest.
 b. moving objects.
 c. both moving and nonmoving objects.

SP1d
26 13. Friction
 a. comes from microscopic bumps that act as
obstructions to the object's motion.  b. is the name given to the force acting between
surfaces sliding past one another.  c. acts in a direction that opposes the motion of
an object.  d. all of the above
 e. none of the above
27 13. Friction
 a. comes from microscopic bumps that act as
obstructions to the object's motion.  b. is the name given to the force acting between
surfaces sliding past one another.  c. acts in a direction that opposes the motion of
an object.  d. all of the above
 e. none of the above

SP1d
28 14. Which has more mass, a kilogram of feathers
or a kilogram of iron?  The feathers
 The iron
 c. Neitherthey both have the same mass.

SP1d
29 14. Which has more mass, a kilogram of feathers
or a kilogram of iron?  The feathers
 The iron
 c. Neitherthey both have the same mass.

SP1d
30 15. How much does a 3.0kg bag of bolts weigh?
 a.7.2 N
 b.14.4 N
 c.22.8 N
 d.29.4 N
 e.58.8 N

SP1d
31 15. How much does a 3.0kg bag of bolts weigh?
 a.7.2 N
 b.14.4 N
 c.22.8 N
 d.29.4 N
 e.58.8 N


SP1d
32 16. On the surface of the Moon, a ball is thrown
straight up with an initial velocity. The ball
has a constant acceleration due to the Moons
gravity.  On a graph of the balls velocity versus time,
which of the following would represent the ball
at its highest point above the Moons surface?  A. when the velocity is equal to 0 m/s
 B. when the velocity is equal to 1.6 m/s
 C. when the velocity has its greatest value
 D. when the velocity has its most negative value
 SPS8 a
33 16. On the surface of the Moon, a ball is thrown
straight up with an initial velocity. The ball
has a constant acceleration due to the Moons
gravity.  On a graph of the balls velocity versus time,
which of the following would represent the ball
at its highest point above the Moons surface?  A. when the velocity is equal to 0 m/s
 B. when the velocity is equal to 1.6 m/s
 C. when the velocity has its greatest value
 D. when the velocity has its most negative value
 SPS8 a
34 17. A rocket is launched at a speed of 10
kilometers per second. How far will it travel in
1/2 minute?  A. 300 km
 B. 5 km
 C. 3000 m
 D. 600 m
 SPS8 a
35 17. A rocket is launched at a speed of 10
kilometers per second. How far will it travel in
1/2 minute?  A. 300 km
 B. 5 km
 C. 3000 m
 D. 600 m
 SPS8 a
36 18. Speed is
 a measure of how fast something is moving.
 always measured in terms of a unit of distance
divided by a unit of time.  the distance covered per unit time.
 all of the above.
 none of the above.

SP1a,b
37 18. Speed is
 a measure of how fast something is moving.
 always measured in terms of a unit of distance
divided by a unit of time.  the distance covered per unit time.
 all of the above.
 none of the above.

SP1a,b
38 19. One possible unit of speed is
 miles per hour.
 light years per century.
 kilometers per hour.
 all of the above
 none of the above.

SP1a,b
39 19. One possible unit of speed is
 miles per hour.
 light years per century.
 kilometers per hour.
 all of the above
 none of the above.

SP1a,b
40 20. An elevator in an office building completed
the following trips  1st floor to 8th floor
 8th floor to 4th floor
 4th floor to 13th floor
 The distance between each floor of the office
building is 3.0 m.  Which table shows the total distance traveled and
displacement of the elevator?  SP1a,b
41 42 21. The table below shows the time it takes four
cars to go from 0 to 60 km/h.  Based on the information given, which of the
following quantities can be compared for the four
cars?  A. average acceleration
 B. instantaneous speed
 C. stopping distance
 D. stopping time
SP1a,b
43 21. The table below shows the time it takes four
cars to go from 0 to 60 km/h.  Based on the information given, which of the
following quantities can be compared for the four
cars?  A. average acceleration
 B. instantaneous speed
 C. stopping distance
 D. stopping time
SP1a,b
44 22. If an object has an acceleration
 of 0 m/s2, then one can be sure
 that the object is not ____.
 moving
 changing position
 changing velocity

 SP1a,b
45 22. If an object has an acceleration
 of 0 m/s2, then one can be sure
 that the object is not ____.
 moving
 changing position
 changing velocity
 SP1a,b
4623. Which one of the following statements is NOT
true of a freefalling object? An object in a
state of free fall ____. a. falls with a constant
speed of 10 m/s. b. falls with a acceleration of
10 m/s/s. c. falls under the sole influence of
gravity. d. falls with downward acceleration
which has a constant magnitude.
SP1a,b
4723. Which one of the following statements is NOT
true of a freefalling object? An object in a
state of free fall ____. a. falls with a constant
speed of 10 m/s. b. falls with a acceleration of
10 m/s/s. c. falls under the sole influence of
gravity. d. falls with downward acceleration
which has a constant magnitude.
SP1a,b
48 24. Which of the following statements about free
fall and the acceleration of gravity are TRUE?
List all that apply.  a. An object that is freefalling is acted
 upon by the force of gravity alone.
 b. A falling skydiver which has reached
 terminal velocity is considered to be
 in a state of free fall.
 c. A ball is thrown upwards and is rising towards
its peak. As it rises upwards, it is
NOT considered to be in a state of free fall.
SP1a,b
49d. An object in free fall experiences an
acceleration which is independent of the mass of
the object. e. A ball is thrown upwards, rises
to its peak and eventually falls back to the
original height. As the ball rises, its
acceleration is upwards as it falls, its
acceleration is downwards.
SP1a,b
50f. A ball is thrown upwards, rises to its peak
and eventually falls back to the original height.
The speed at which it is launched equals the
speed at which it lands. (Assume negligible air
resistance.) g. A very massive object will free
fall at the same rate of acceleration as a less
massive object.
SP1a,b
51 h. The value of g on Earth is approximately 9.8
m/s2.  The symbol g stands for the force of gravity.
 SP1a,b
52a. An object that is freefalling is acted upon
by the force of gravity alone. TRUE  Yes! This
is the definition of free fall.
53b. A falling skydiver which has reached terminal
velocity is considered to be in a state of free
fall. FALSE  Skydivers which are falling at
terminal velocity are acted upon by large amounts
of air resistance. They are experiencing more
forces than the force of gravity. As such, they
are NOT freefalling.
54c. A ball is thrown upwards and is rising towards
its peak. As it rises upwards, it is
NOT considered to be in a state of free fall.
FALSE  Any object  whether rising, falling or
moving horizontally and vertically simultaneously
 can be in a state of free fall if the only
force acting upon it is the force of gravity.
Such objects are known as projectiles and often
begin their motion while rising upwards.
55d. An object in free fall experiences an
acceleration which is independent of the mass of
the object. TRUE  The unique feature of
freefalling objects is that the mass of the
object does not effect the trajectory
characteristics. The acceleration, velocity,
displacement, etc. is independent of the mass of
the object.
56e. A ball is thrown upwards, rises to its peak
and eventually falls back to the original height.
As the ball rises, its acceleration is upwards
as it falls, its acceleration is downwards.
FALSE  The acceleration of all freefalling
objects is directed downwards. A rising object
slows down due to the downward gravity force. An
upwardmoving object which is slowing down is
said to have a downwards acceleration.
57f. A ball is thrown upwards, rises to its peak
and eventually falls back to the original height.
The speed at which it is launched equals the
speed at which it lands. (Assume negligible air
resistance.) TRUE  If the object is truly in
freefall, then the speed of the object will be
the same at all heights  whether its on the
upward portion of its trajectory or the downwards
portion of its trajectory.
58g. A very massive object will free fall at the
same rate of acceleration as a less massive
object. TRUE  The acceleration of freefalling
objects (referred to as the acceleration of
gravity) is independent of mass. On Earth, the
value is 9.8 m/s/s (the direction is down). All
objects  very massive and less massive 
experience this acceleration value.
59h.The value of g on Earth is approximately 9.8
m/s2. TRUE  Yes! Know this one!
60i.The symbol g stands for the force of
gravity. FALSE  Nope. g is known as
the acceleration of gravity. It might be best to
call it the acceleration caused by gravity.
When it comes to the force of gravity, we have
yet another symbol for that  Fgrav.
6125. If car A passes car B, then car A must be
____. a. accelerating. b. accelerating at a
greater rate than car B. c. moving faster than
car B and accelerating more than car B. d. moving
faster than car B, but not necessarily
accelerating.
SP1a,b
6225. If car A passes car B, then car A must be
____. a. accelerating. b. accelerating at a
greater rate than car B. c. moving faster than
car B and accelerating more than car B. d. moving
faster than car B, but not necessarily
accelerating. All that is necessary is that car
A has a greater speed (is moving faster). If so,
it will eventually catch up and pass car B.
Acceleration is not necessary to overcome car B
SP1a,b
6326. Consider drops of water that leak from a
dripping faucet at a constant rate. As the drops
fall they ____. a. get closer together b. get
farther apart c. remain at a relatively fixed
distance from one another
SP1a,b
6426.Consider drops of water that leak from a
dripping faucet at a constant rate. As the drops
fall they ____. a. get closer together b. get
farther apart c. remain at a relatively fixed
distance from one another Since the drops of
water are falling (and probably freefalling),
they should be getting farther apart as they
fall. This is because the freefalling drops are
accelerating and thus gaining speed.
SP1a,b
65 27. If an object is moving eastward and slowing
down, then the direction of its velocity vector
is ____.  eastward
 westward
 neither
 not enough information to tell

 SP1a,b
66 27. If an object is moving eastward and slowing
down, then the direction of its velocity vector
is ____.  eastward
 westward
 neither
 not enough information to tell

 SP1a,b
67 28. If an object is moving eastward and slowing
down, then the direction of its acceleration
vector is ____.  eastward
 westward
 neither
 not enough information to tell

 SP1a,b
68 28. If an object is moving eastward and slowing
down, then the direction of its velocity vector
is ____.  eastward
 westward
 neither
 not enough information to tell

 SP1a,b
69 29. The average speed of an object which moves 10
kilometers (km) in 30 minutes is ____.  10km/hr
 20km/hr
 30km/hr
 more than 30km/hr

 SP1a,b
70 29. The average speed of an object which moves 10
kilometers (km) in 30 minutes is ____.  10km/hr
 20km/hr
 30km/hr
 more than 30km/hr
 The average speed is distance/time. In this case
the distance is 10 km and the time is 0.5 hr (30
minutes). Thus  average speed (10 km)/(0.5 hr) 20 km/hr

 SP1a,b
7130. As an object freely falls, its ____. a. speed
increases b. acceleration increases c. both of
these d. neither of these
SP1a,b
7230. As an object freely falls, its ____. a. speed
increases b. acceleration increases c. both of
these d. neither of these As an object falls, it
accelerates this means that the speed will be
changing. While falling, the speed increases by
10 m/s every second. The acceleration is a
constant value of 10 m/s/s
SP1a,b
73 31. On takeoff, a rocket accelerates from rest at
a rate of 50 m/s2 for exactly 1 minute. The
rocket's speed after this minute of steady
acceleration will be ____ m/s.  50
 500
 3x10E3
 3.6x10E3
 none of these
 SP1a,b
74 31. On takeoff, a rocket accelerates from rest at
a rate of 50 m/s2 for exactly 1 minute. The
rocket's speed after this minute of steady
acceleration will be ____ m/s.  50
 500
 3.00x103
 3.60x103
 none of these
 Use the equation
 vf vi at
 vf 0 (50.0 m/s/s)(60.0 s) 3.00 x 103 m/s
 SP1a,b
75 32. When a rock is dropped, it will accelerate
downward at a rate of 9.8 m/s2. If the same rock
is thrown downward (instead of being dropped from
rest), its acceleration will be ____. (Ignore air
resistance effects.)  less than 9.8m/s2
 9.8m/s2
 more than 9.8m/s2

SP1a,b
76 32. When a rock is dropped, it will accelerate
downward at a rate of 9.8 m/s2. If the same rock
is thrown downward (instead of being dropped from
rest), its acceleration will be ____. (Ignore air
resistance effects.)  less than 9.8m/s2
 9.8m/s2
 more than 9.8m/s2
 Whether rising or falling, if the sole force
acting upon the object is gravity, then the
acceleration is 9.8 m/s/s (often approximated as
10 m/s/s). 
SP1a,b
7733. Ima Rilla Saari is cruising at 28.0 m/s down
Lake Avenue and through the forest preserve. She
notices a deer jump into the road at a location
62.0 m in front of her. Ima first reacts to the
event, then slams on her brakes and decelerates
at 8.10 m/s2, and ultimately stops a picometer
in front of the frozen deer. What is Ima's
reaction time? (i.e., how long did it take Ima to
react to the event prior to decelerating?
SP1a,b
7833. Ima's total distance traveled (62.0 m) can be
broken into two segments  a reaction distance
(drxn) and a braking distance (dbraking). The
reaction distance is the distance Ima moves prior
to braking she will move at constant speed
during this time of trxn.
SP1a,b
7933. The braking distance is the distance which
Ima moves when her foot is on the brake and she
decelerates from 28.0 m/s to 0.0 m/s. The
braking distance can be computed first using the
following kinematic equation vf2 vo2 2ad.
The known information for this braking period is
vo 28.0 m/s vf 0 m/s and a 8.10 m/s/s.
SP1a,b
8033. vf2 vo2 2ad. The known information
for this braking period is vo 28.0 m/s vf 0
m/s and a 8.10 m/s/s. dbraking (vf2 
vo2) / (2a) (0 m/s)2  (280 m/s)2 / (2
8.10 m/s/s) 48.40 m
SP1a,b
8133. Since Ima's car requires 48.40 m to brake,
she can travel a maximum of 13.6 m during the
reaction period. The relationship between
reaction time, speed and reaction distance is
given by the equation drxn v trxn SP1a,b
8233. drxn v trxn Substituting 13.6 m for
drxn and 28.0 m/s for v, the reaction time can be
computed trxn (13.6 m) / (28.0 m/s) 0.486 s
SP1a,b
8334. Construct freebody diagrams for the
following physical situations. a. A ball is
dropped from rest from the top of a building.
Assume negligible air resistance. In the
absence of Fair, the only force acting upon the
ball is gravity. It is a projectile.
SP1f
8434b. After being thrown, a football is moving
upwards and rightwards towards the peak of its
trajectory. Assume negligible air
resistance. In the absence of Fair, the only
force acting upon the ball is gravity. It is a
projectile. Note that an upwards moving object
does not need an upwards force. Only an upwards
accelerating object requires an upwards force.
SP1f
SP1a,b
8534c. After reaching a terminal velocity, the
falling skydiver then opens a parachute. Whe
n the terminal velocity was reached, Fa Fg.
Then the parachute was opened, making Fair even
greater than before. This is represented by the
larger arrow.
SP1f
8634d. An air track glider is gliding to the right
at constant velocity. There is no rightwards
force. A rightwards force would only be required
if there is a rightwards acceleration. If the
glider is gliding there is no mention of it
being pushed or pulled (Fapp) and if there is a
constant velocity, there must be balanced
forces.
SP1f
8734e. A car is skidding to a stop while traveling
to the right. There is no rightwards force.
A rightwards force would only be required if
there is a rightwards acceleration. If the car is
skidding (wheels are locked), friction acts in a
direction opposite its motion to slow it down.
SP1f SP1a,b
8834f. A downward moving elevator (held by a cable)
slows down. The cable supplies the tension
force. Since the elevator is moving downwards and
slowing down, there must be more upwards force
than the downwards gravity force.
SP1f SP1a,b
8934g. A 25.0N force is applied at a 30degree
angle to a crate in order to accelerate it
rightward across a rough, horizontal
surface. The applied force is upwards and
rightwards. Its upward component contributes to
the upwards Fn to balance the force of gravity.
(Note the relative size of Fn.)
SP1f SP1a,b
9034h. A picture hangs symmetrically by two wires
oriented at angles to the vertical. The
force exerted by a wire is a tension force. With
two wires, there would be two upwardspulling
tension forces. The down force is gravity.
SP1f
91 34i. A large crate slowly accelerated down a
steep and rough inclined plane.  There are only three forces present. The Fpar and
Fperp are merely components of gravity they are
not separate forces. The normal force is
perpendicular to the surface (drawn in blue). 
SP1f  SP1a,b
9235. Which of the following are always true of an
object that is at equilibrium? Include all that
apply. a. All the forces acting upon the object
are equal. b. The object is at rest. c. The
object is moving and moving with a constant
velocity. d. The object has an acceleration of
zero. e. There is no change in the object's
velocity. f. The sum of all the forces is 0
N. g. All the forces acting upon an object are
balanced.
SP1f SP1a,b
9335. Which of the following are always true of an
object that is at equilibrium? Include all that
apply. a. All the forces acting upon the object
are equal. b. The object is at rest. c. The
object is moving and moving with a constant
velocity. d. The object has an acceleration of
zero. e. There is no change in the object's
velocity. f. The sum of all the forces is 0 N. g.
All the forces acting upon an object are
balanced.
SP1f SP1a,b
9436. Which one(s) of the following force diagrams
depict an object moving to the right with
constant speed? Write all possible answers (if
any) in the blank ________________
Explain your answer.
SP1f
9536. Which one(s) of the following force diagrams
depict an object moving to the right with
constant speed? Write all possible answers (if
any) in the blank a and c
SP1f
9637. How much net force is required to keep a 5kg
object moving rightward with a constant velocity
of 2 m/s? ________ Explain or show your work.
SP1f
9737. How much net force is required to keep a 5kg
object moving rightward with a constant velocity
of 2 m/s? ________ Explain or show your work.
Answer 0 N If the velocity is constant, then
the acceleration is 0 m/s/s and the net force is
zero. A net force is only required in order to
accelerate an object.
SP1f
9838. Solve for the missing quantities.
_________N
Fa ________N
Fg 700 N
m ________ a 5.0m/s/s left
SP1f
9938.
SP1f
100 39. A ball is thrown into the air at some angle.
At the very top of its path, the velocity is  entirely vertical
 entirely horizontal
 both vertical and horizontal
 there is not enough information to determine.
SP1f
101 39. A ball is thrown into the air at some angle.
At the very top of its path, the velocity is  entirely vertical
 entirely horizontal
 both vertical and horizontal
 there is not enough information to determine.
SP1f
102 40. A 50N force is applied at an angle of 30
degrees north of east. This would be the same as
applying two forces at  a. 43 N, east and 7 N, north
 b. 35 N, east and 15 N, north
 c. 25 N, east and 25 N, north
 43 N, east and 25 N, north

 SP1f
 SP1a,b
103 40. A 50N force is applied at an angle of 30
degrees north of east. This would be the same as
applying two forces at  a. 43 N, east and 7 N, north
 b. 35 N, east and 15 N, north
 c. 25 N, east and 25 N, north
 43 N, east and 25 N, north
 Answer D
 A 50N force at 30 degrees would have two
components  43 N, east and 25 N, north. These
two forces would be equal to the 50N force at 30
degrees N of E. They are calculated as  Feast (50 N)cos(30 deg)
 Fnorth (50 N)sin(30 deg)

SP1f  SP1a,b
104 41. An object rests upon an inclined plane. If
the angle of incline is increased, then the
normal force would _______.  increase
 decrease
 remain the same
SP1f
105 41. An object rests upon an inclined plane. If
the angle of incline is increased, then the
normal force would _______.  increase
 decrease
 remain the same
 The normal force is equal to the perpendicular
component of the weight vector. So Fnorm Fperp
mgcos(angle). If the incline angle is
increased, the cos(angle) decreases towards 0
thus, the normal force decreases as well.
SP1f
10642. A ball is projected horizontally from the top
of a 92.0meter high cliff with an initial speed
of 19.8 m/s. Determine (a) the horizontal
displacement, and (b) the final speed the
instant prior to hitting the ground. Use g 9.8
m/s2
SP1f
10743. Determine the launch speed of a
horizontallylaunched projectile which lands 26.3
meters from the base of a 19.3meter high cliff.
SP1f
10844. A soccer ball is kicked horizontally at 15.8
m/s off the top of a field house and lands 33.9
meters from the base of the field house.
Determine the height of the field house.
SP1f
10945. Which of the following statements are true of
inertia? a. Inertia is a force. b. Inertia is a
force which keeps stationary objects at rest and
moving objects in motion at constant velocity. c.
Inertia is a force which brings all objects to a
rest position. d. All objects have inertia.
SP1f
11045. e. A more massive object has more inertia
than a less massive object. f. Fastmoving
objects have more inertia than slowmoving
objects. g. An object would not have any inertia
in a gravityfree environment (if there is such a
place). h. Inertia is the tendency of all objects
to resist motion and ultimately stop.
SP1f
11145. i. In a gravityfree environment (should
there be one), a person with a lot of inertia
would have the same ability to make a turn as a
person with a small amount of inertia.
SP1f
11245. Which of the following statements are true of
inertia? a. Inertia is a force. FALSE b. Inertia
is a force which keeps stationary objects at rest
and moving objects in motion at constant
velocity. FALSE c. Inertia is a force which
brings all objects to a rest position. FALSE d.
All objects have inertia. TRUE
SP1f
11345. e. A more massive object has more inertia
than a less massive object. TRUE f. Fastmoving
objects have more inertia than slowmoving
objects. FALSE g. An object would not have any
inertia in a gravityfree environment (if there
is such a place). FALSE h. Inertia is the
tendency of all objects to resist motion and
ultimately stop. FALSE
11445. i. In a gravityfree environment (should
there be one), a person with a lot of inertia
would have the same ability to make a turn as a
person with a small amount of inertia. FALSE
SP1f
11546. Which of the following statements are true
of the quantity mass? a. The mass of an object
is dependent upon the value of the acceleration
of gravity. b. The standard metric unit of mass
is the kilogram. c. Mass depends on how much
stuff is present in an object.
SP1a,d
116d. The mass of an object is variable and
dependent upon its location. e. An object would
have more mass on Mount Everest than the same
object in the middle of Lake Michigan.
SP1a,d
117 f. People in Weight Watcher's are really
concerned about their mass (they're mass
watchers).  g. The mass of an object can be
 measured in pounds.
 If all other variables are equal, then
 an object with a greater mass would
 have a more difficult time accelerating.
SP1a,d
118 i. If all other variables are equal, then it
would require less exerted force to stop a less
massive object than to stop a more massive
object. j. The mass of an object is
mathematically related to the weight of the
object.
SP1a,d
11946. Which of the following statements are true
of the quantity mass? a. The mass of an object
is dependent upon the value of the acceleration
of gravity. FALSE b. The standard metric unit
of mass is the kilogram. TRUE c. Mass depends
on how much stuff is present in an object. TRUE
SP1a,d
120d. The mass of an object is variable and
dependent upon its location. FALSE e. An
object would have more mass on Mount Everest than
the same object in the middle of Lake Michigan.
FALSE
SP1a,d
121 f. People in Weight Watcher's are really
concerned about their mass (they're mass
watchers). TRUE  g. The mass of an object can be
 measured in pounds. FALSE
 If all other variables are equal, then
 an object with a greater mass would
 have a more difficult time accelerating. TRUE
SP1a,d
122 i. If all other variables are equal, then it
would require less exerted force to stop a less
massive object than to stop a more massive
object. TRUE j. The mass of an object is
mathematically related to the weight of the
object. TRUE
SP1a,d
12347. Which of the following statements are true of
the quantity weight? List all that apply. a. The
weight of an object is dependent upon the value
of the acceleration of gravity. b. Weight refers
to a force experienced by an object. c. The
weight of an object would be less on the Moon
than on the Earth.
SP1a,d
12447. d. A person could reduce their weight
significantly by taking an airplane ride to the
top of Mount Everest. e. Two objects of the same
mass can weigh differently. f. To gain weight,
one must put on more mass. g. The weight of an
object can be measured in kilograms.
SP1a,d
12547. h. The weight of an object is equal to the
force of gravity acting upon the object. i. When
a chemistry student places a beaker on a balance
and determines it to be 84.3 grams, they have
weighed the beaker.
SP1a,d
12647. Which of the following statements are true of
the quantity weight? List all that apply. a. The
weight of an object is dependent upon the value
of the acceleration of gravity. TRUE b. Weight
refers to a force experienced by an object.
TRUE c. The weight of an object would be less on
the Moon than on the Earth. TRUE
SP1a,d
12747. d. A person could reduce their weight
significantly by taking an airplane ride to the
top of Mount Everest. FALSE e. Two objects of
the same mass can weigh differently. True (at
different gravitational locations) f. To gain
weight, one must put on more mass. Mostly TRUE
(or change gravitational force) g. The weight of
an object can be measured in kilograms. FALSE
SP1a,d
12847. h. The weight of an object is equal to the
force of gravity acting upon the object.
TRUE i. When a chemistry student places a beaker
on a balance and determines it to be 84.3 grams,
they have weighed the beaker. FALSE
SP1a,d
129 48. The amount of net force required to keep a
5kg object moving rightward with a constant
velocity of 2 m/s is ____.  0 N
 0.4 N
 2.0 N
 2.5 N
 5.0N
SP1a,d
130 48. The amount of net force required to keep a
5kg object moving rightward with a constant
velocity of 2 m/s is ____.  0 N
 0.4 N
 2.0 N
 2.5 N
 5.0N
SP1a,d
13149. A. Big Bubba has a mass of 100 kg on the
earth. What is Big Bubba's mass on the moon where
the force of gravity is approximately 1/6th
that of Earth's? ________ Explain or show your
work. b. Little Billie weighs 360 N on Earth.
What is Little Billie's mass on the moon where
the force of gravity is approximately 1/6th that
of Earth's? ________ Explain or show your work.
SP1a,d
13249. A. Big Bubba has a mass of 100 kg on the
earth. What is Big Bubba's mass on the moon where
the force of gravity is approximately 1/6th
that of Earth's? ________ Explain or show your
work. Answer 100 kg Mass is a quantity which is
independent of the location of the object. So if
Big Bubba has a mass of 100 kg on Earth, then he
also has a mass of 100 kg on the moon. Only the
weight would change as Big Bubba is moved from
the Earth to the moon.
SP1a,d
13349. b. Little Billie weighs 360 N on Earth. What
is Little Billie's mass on the moon where the
force of gravity is approximately 1/6th that of
Earth's? ________ Explain or show your
work. Answer 36 kg The mass of an object is
related to weight by the equation W mg where g
10 m/s/s on Earth and onesixth this value
(1.67) on the moon. So if Billy weighs 360 N on
Earth, then his mass is approximately 36 kg. His
mass on the moon will be the same as his mass on
Earth.
SP1a,d
13450. Consider Newton's second law of motion to
determine which of the following statements are
true? List all that apply. a. If an object is
accelerating to the right, the net force on the
object must be directed towards the right. b. If
an object is moving to the right and slowing
down, then the net force on the object is
directed towards the left. c. Accelerating
objects are either slowing down or speeding up.
SP1a,d
13550. d. The acceleration of an object is directly
dependent upon its mass and inversely dependent
upon its net force. e. An object has an
acceleration of 8 m/s/s. If the net force acting
upon the object is increased by a factor of 2,
then the new acceleration would be 10 m/s/s. f.
An object has an acceleration of 8 m/s/s. If the
net force acting upon the object is increased by
a factor of 3, then the new acceleration would be
11 m/s/s.
SP1a,d
136 50. g. An object has an acceleration of 8 m/s/s.
If the mass of the object is increased by a
factor of 2, then the new acceleration would be
16 m/s/s.  h. An object has an acceleration of 8 m/s/s. If
the mass of the object is increased by a factor
of 4, then the new acceleration would be 2 m/s/s.  An object has an acceleration of 8 m/s/s. If
 the net force acting upon the object is
 increased by a factor of 2 and the mass of the
 object is decreased by a factor of 2,
 the acceleration would still be 8 m/s/s.
SP1a,d
13750. j. An object has an acceleration of 8 m/s/s.
If the net force acting upon the object is
increased by a factor of 2 and the mass of the
object is increased by a factor of 4, then the
new acceleration would be 4 m/s/s. k. An object
has an acceleration of 8 m/s/s. If the net force
acting upon the object is decreased by a factor
of 2 and the mass of the object is increased by a
factor of 4, then the new acceleration would be 1
m/s/s.
SP1a,d
13850. l. An object has an acceleration of 8 m/s/s.
If the net force acting upon the object is
increased by a factor of 4 and the mass of the
object is increased by a factor of 2, then the
new acceleration would be 16 m/s/s. m. A 2kg
object accelerates from rest to a final velocity
of 6 m/s in 3 seconds. The net force acting upon
the object is 12 N.
SP1a,d
13950. n. A 10kg object slows down from 24 m/s to
a final velocity of 9 m/s in 3 seconds. The net
force acting upon the object is 80 N.
SP1a,d
14050. Consider Newton's second law of motion to
determine which of the following statements are
true? List all that apply. a. If an object is
accelerating to the right, the net force on the
object must be directed towards the right.
TRUE b. If an object is moving to the right and
slowing down, then the net force on the object is
directed towards the left. TRUE c. Accelerating
objects are either slowing down or speeding up.
FALSE
SP1a,d
14150. d. The acceleration of an object is directly
dependent upon its mass and inversely dependent
upon its net force. FALSE e. An object has an
acceleration of 8 m/s/s. If the net force acting
upon the object is increased by a factor of 2,
then the new acceleration would be 10 m/s/s.
FALSE f. An object has an acceleration of 8
m/s/s. If the net force acting upon the object is
increased by a factor of 3, then the new
acceleration would be 11 m/s/s. FALSE
SP1a,d
142 50. g. An object has an acceleration of 8 m/s/s.
If the mass of the object is increased by a
factor of 2, then the new acceleration would be
16 m/s/s. FALSE  h. An object has an acceleration of 8 m/s/s. If
the mass of the object is increased by a factor
of 4, then the new acceleration would be 2 m/s/s.
TRUE  An object has an acceleration of 8 m/s/s. If
 the net force acting upon the object is
 increased by a factor of 2 and the mass of the
 object is decreased by a factor of 2,
 the acceleration would still be 8 m/s/s. FALSE
14350. j. An object has an acceleration of 8 m/s/s.
If the net force acting upon the object is
increased by a factor of 2 and the mass of the
object is increased by a factor of 4, then the
new acceleration would be 4 m/s/s. TRUE k. An
object has an acceleration of 8 m/s/s. If the net
force acting upon the object is decreased by a
factor of 2 and the mass of the object is
increased by a factor of 4, then the new
acceleration would be 1 m/s/s. TRUE
SP1a,d
14450. l. An object has an acceleration of 8 m/s/s.
If the net force acting upon the object is
increased by a factor of 4 and the mass of the
object is increased by a factor of 2, then the
new acceleration would be 16 m/s/s. TRUE m. A
2kg object accelerates from rest to a final
velocity of 6 m/s in 3 seconds. The net force
acting upon the object is 12 N. FALSE
SP1a,d
14550. n. A 10kg object slows down from 24 m/s to
a final velocity of 9 m/s in 3 seconds. The net
force acting upon the object is 80 N. FALSE
SP1a,d
14651. TRUE or FALSE For an object resting upon a
nonaccelerating surface, the normal force is
equal to the weight of the object.
SP1a,d
14751. TRUE or FALSE For an object resting upon a
nonaccelerating surface, the normal force is
equal to the weight of the object. Answer
False The normal force is not necessarily always
equal to the weight of an object. Suppose that a
person weighs 800 N and sits at rest upon a
table. Then suppose another person comes along
and pushes downwards upon the persons shoulders,
applying a downward force of 200 N. The normal
force becomes 1000N.
SP1a,d
148 According to Newton's third law, every force is
accompanied by an equal and opposite reaction
force. The reason that these forces do not cancel
each other is ____.  a. the action force acts for a longer time period
 b. the two forces are not always in the same
direction  c. one of the two forces is greater than the
other  d. the two forces act upon different objects
only forces on the same object can balance each
other.  e. ... nonsense! They do cancel each other.
Objects accelerate because of the presence of a
third force
SP1a,d
14952. Answer D Action and reaction forces always
act upon the interacting objects for the same
amount of time with the same magnitude. So if
object A pushes on object B, then object B
simultaneously pushes on object A with the same
amount of force. The force on object B will be
one of perhaps many forces which will govern its
motion. But the reaction force is on object A and
cannot contribute to object B's motion since it
is not acting upon object B. Actionreaction
forces can NEVER cancel each other.
SP1a,d
15053. As you sit in your chair and study your
physics (presuming that you do), the force of
gravity acts downward upon your body. The
reaction force to the force of the Earth pulling
you downward is ___. a. the force of the chair
pushing you upward b. the force of the floor
pushing your chair upward c. the force of the
Earth pushing you upward d. the force of air
molecules pushing you upwards e. the force of
your body pulling the Earth upwards f. ...
nonsense! Gravity is a field force and there is
no such reaction force.
SP1a,d
15153. Answer E The most common wrong answer is a 
the force of the chair pushing you upward. As you
sit in your chair, the chair is indeed pushing
you upward but this is not the reaction force to
the force of the Earth pulling you downward. The
chair pushing you upward is the reaction force to
you sitting on it and pushing the chair downward.
So if the Earth pulls you downward, then the
reaction force is you pull the Earth upward.
SP1a,d
152 54. A golf pro places a ball at rest on the tee,
lines up his shot, draws back his club, and lets
one rip. During the contact of the golf club with
the golf ball, the force of the club on the ball
is ____ the force of the ball on the club and the
acceleration of the club is ____ than the
acceleration of the ball.  greater than, greater than
 b. greater than, equal to
 greater than, less than
 less than, less than
 less than, equal to
 less than, greater than
 equal to, equal to
 equal to, greater than
 equal to, less than
SP1a,d
15354. A golf pro places a ball at rest on the tee,
lines up his shot, draws back his club, and lets
one rip. During the contact of the golf club with
the golf ball, the force of the club on the ball
is ____ the force of the ball on the club and the
acceleration of the club is ____ than the
acceleration of the ball. i. equal to, less
than For every action, there is an equal and
opposite reaction force. In this case, the force
on the club is equal to the force on the ball.
The subsequent accelerations of the interacting
objects will be inversely dependent upon mass.
The more massive club will have less acceleration
than the less massive ball.
SP1a,d
154 55. Each one of Newton's Laws can play a role in
any one particular situation. However, one of the
laws is often most obviously dominant in
governing the motion of a situation. Pick which
of Newton's most governs the situations described
below.  A helicopter must have two sets of blades in
order to fly with stability.  If you were in an elevator and the cable broke,
jumping up just before the elevator hit the
ground would not save you. Sorry.  You usually jerk a paper towel from a roll in
order to tear it instead of pulling it smoothly.
SP1a,d
15555. d. A student desk changes the amount of force
it puts on other objects throughout a school
day. e. Heavy objects are not easier to move
around in a horizontal fashion on the Moon than
on the Earth. f. The stronger, heavier team in a
tugofwar does not create a larger tension in
the rope than the weaker, lighter team.
SP1a,d
156 55. a. A helicopter must have two sets of blades
in  order to fly with stability. 3rd law
 b. If you were in an elevator and the cable
broke, jumping up just before the elevator hit
the ground would not save you. Sorry. 1st law  c. You usually jerk a paper towel from a roll in
order to tear it instead of pulling it smoothly.
1st law  d. A student desk changes the amount of force it
puts  on other objects throughout a school day.
3rd law  Heavy objects are not easier to move around in a
horizontal fashion on the Moon than on the Earth.
1st law  The stronger, heavier team in a tugofwar does
not create a larger tension in the rope than the
weaker, lighter team. 3rd law
SP1a,d
15756. For the next several questions, consider the
velocitytime plot below for the motion of an
object along a horizontal surface. The motion
is divided into several time intervals, each
labeled with a letter.
SP1a,d
15856a. During which time interval(s), if
any, are there no forces acting upon the object?
List all that apply.
SP1a,d
15956b. During which time interval(s), if any,
are the forces acting upon the object balanced?
List all that apply.
SP1a,d
16056c. During which time interval(s), if any,
is there a net force acting upon the object?
List all that apply.
SP1a,d
16156d. During which time interval(s), if any,
is the net force acting upon the object
directed toward the right? List all that apply
SP1a,d
16256e. During which time interval(s), if any,
is the net force acting upon the object
directed toward the left? List all that apply.
SP1a,d
163 56 answers
 None  If an object is on a surface, one can be
 guaranteed of at least two forces
 gravity and normal force.
 b. BDFH  If the forces are balanced, then an
object is  moving with a constant velocity. This is
represented by  a horizontal line on a velocitytime plot.
 c. ACEG  If an object has a net force upon it,
then it is  accelerating. Acceleration is represented by a
sloped  line on a velocitytime plot.
 d. AE  If the net force is directed to the
right, then the  acceleration is to the right (in the
direction).  This is represented by a line with a slope
(i.e., upward slope).  e. CG  If the net force is directed to the left,
then the  acceleration is to the left (in the  direction).
This is  represented by a line with a  slope (i.e.,
downward slope).
SP1a,d
16457.Which of the following statements are true
about momentum? a. Momentum is a vector
quantity. b. The standard unit on momentum is the
Joule. c. An object with mass will have
momentum. d. An object which is moving at a
constant speed has momentum. e. An object can be
traveling eastward and slowing down its momentum
is westward.
SP3c
165f. Momentum is a conserved quantity the momentum
of an object is never changed. g. The momentum of
an object varies directly with the speed of the
object. h. Two objects of different mass are
moving at the same speed the more massive object
will have the greatest momentum.
SP3c
166i. A less massive object can never have more
momentum than a more massive object. j. Two
identical objects are moving in opposite
directions at the same speed. The forward moving
object will have the greatest momentum. k. An
object with a changing speed will have a changing
momentum.
SP3c
16757.Which of the following statements are true
about momentum? a. Momentum is a vector
quantity.TRUE b. The standard unit on momentum is
the Joule. FALSE c. An object with mass will have
momentum. FALSE d. An object which is moving at a
constant speed has momentum. TRUE e. An object
can be traveling eastward and slowing down its
momentum is westward. FALSE
SP3c
168f. Momentum is a conserved quantity the momentum
of an object is never changed. FALSE g. The
momentum of an object varies directly with the
speed of the object. TRUE h. Two objects of
different mass are moving at the same speed the
more massive object will have the greatest
momentum. TRUE
SP3c
169i. A less massive object can never have more
momentum than a more massive object. FALSE j. Two
identical objects are moving in opposite
directions at the same speed. The forward moving
object will have the greatest momentum.
FALSE k. An object with a changing speed will
have a changing momentum. TRUE
SP3c
17058. Suppose that you're driving down