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Forces and Motion

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Forces and Motion 2013 M.B. Pardington, BPS Electrical Charges The attracting and repelling electrical forces illustrated in the wind sock demonstration show non ... – PowerPoint PPT presentation

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Title: Forces and Motion


1
Forces and Motion
2013 M.B. Pardington, BPS
2
A force is a
PUSH
PULL
3
A force can change the motion of an object.
DIRECTION
SPEED
4
A force can change the motion of an object.
5
An additional force in the same direction
increases the speed of the object.
Push
Push Push
6
An additional force in the same direction
increases the speed of the object.
Push
Push Pull
7
An additional force in the same direction
increases the speed of the object.
Pull
Pull Pull
8
Opposing forces of equal magnitude acting on an
object produce no change in motion.
5 N vs. 5 N Cart doesnt move.
9
Opposing forces of equal magnitude acting on an
object produce no change in motion.
5 N vs. 5 N Cart doesnt move.
10
Opposing forces of unequal magnitude acting on an
object result in a change in motion.
NET FORCE 2 N PUSH to the RIGHT
3 N Pull 5 N Push
11
A change in motion is described as a change in
speed and/or direction of an object.
NET FORCE 2 N PUSH to the RIGHT
3 N Pull 5 N Push
12
BALANCED FORCE
A force must be balanced in order to achieve
constant speed.
13
UNBALANCED FORCE
A force must be unbalanced (nonzero net force) in
order for an object to change speed and/or
direction.
20 N
40 N
14
UNBALANCED FORCE
A force must be unbalanced (nonzero net force) in
order for an object to change speed and/or
direction.
20 N
30 N
50 N
15
UNBALANCED FORCE
A change in the mass of the object will result in
a change in speed and/or direction of the object.
Compare these 3 carts.
16
UNBALANCED FORCE
A change in the mass of the object will result in
a change in speed and/or direction of the object.
Compare these 3 carts.
17
UNBALANCED FORCE
A change in the mass of the object will result in
a change in speed and/or direction of the object.
Compare these 3 carts.
18
Speed
Speed is the ratio of distance covered per unit
of time. Speed distance / time
The cart moved 6 meters per 3 seconds
19
Speed
Mathematically, thats 6 / 3 or 6 3 which
equals 2.
The cart moved 6 meters per 3 seconds
So, the cart moved 2 meters per second or 2 m/sec
20
FORCE
NON-CONTACT
CONTACT
21
Contact Force
22
Contact Force
A contact force is a push or pull that directly
touches the object..
23
Friction
Friction is a contact force exerted between
objects such as
WATER
AIR
OBJECTS
24
Non-Contact Forces
MAGNETISM
GRAVITY
ELECTRICAL CHARGES
25
Non-Contact Forces
These are pushes and pulls from a distance.
26
Gravity
Gravity is a force of attraction between any mass
and the matter near it. The larger the mass of
an object, the greater the gravitational force it
exerts on other objects. For objects on Earth,
the pull of the Earth is the strongest force
acting on them.
27
Gravity
Jupiter is the most massive planet in our Solar
System and therefore, the gravity of Jupiter is
the most intense in the Solar system. Its
gravitational pull is 2.5 times what is here on
Earth.
http//www.universetoday.com/15110/gravity-of-jupi
ter/
28
Gravity
29
Magnetism
N
S
S
N
Here are like charges. Are they showing an
attraction or are they repelling?
30
Magnetism
N
N
S
S
Magnetic Repulsion
They are repelling.
31
Magnetism
N
N
S
S
Here are unlike charges. Are they showing an
attraction or are they repelling?
32
Magnetism
N
N
S
S
Magnetic Attraction
They are showing an attraction.
33
Magnetism
N
N
S
S
N
S
S
N
The attracting and repelling magnetic forces
illustrate non-contact forces. They pull and push
without contact.
34
Electrical Charges
The attracting and repelling electrical forces
illustrated in the wind sock demonstration show
non-contact forces. They push without contact.
35
Bibliography
http//powerup.ukpowernetworks.co.uk/media/22576/7
8.jpg http//www.clipart.dk.co.uk/DKImages/scienc
e/image_science010.jpg http//www.clipart.dk.co.u
k/DKImages/science/image_science009.jpg http//ww
w.universetoday.com/15110/gravity-of-jupiter/ htt
p//www.mikecurtis.org.uk/images/friction.jpg htt
p//lvp.lockyersmid.dorset.sch.uk/pluginfile.php/3
230/mod_resource/content/0/content/pictures/physic
al/keyideas/phpkey0005.jpg http//www.united-stat
es-flag.com/media/catalog/product/cache/1/image/9d
f78eab33525d08d6e5fb8d27136e95/F/L/FLGBDEC10000036
37_-00_st-patricks-wind-sock_4.jpg
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