Snowshoes enable a person to walk on deep snow because the

1
Snowshoes enable a person to walk on deep snow
because the snowshoes increase the ___ over
which the persons weight is distributed.
2
AREA
3
02. ___ can be measured in units of newtons per
square centimeter.
4
PRESSURE
5
03. The pascal is a unit of ___.
6
PRESSURE
7
04. A substance whose shape can easily change is
a(n) ___.
8
FLUID
9
05. ___ pressure is the total force exerted by
the fluid divided by the area over which the
force is exerted.
10
FLUID
11
06. Air pressure exerted equally on an object
from different directions is ___ pressure.
12
BALANCED
13
07. Since the air pressure outside your body is
so great, you arent crushed because the pressure
inside your body ___ the air pressure outside
your body.
14
BALANCES
15
08. Air pressure decreases as ___ increases.
16
ELEVATION, ALTITUDE
17
09. Water pressure ___ as depth increases.
18
INCREASES
19
10. The pressure in the deepest parts of the
ocean is roughly how many times the usual air
pressure you experience?
20
1,000
21
11. Pascals principle deals with ___ substances.
22
FLUID
23
12. A hydraulic device consists of a U-shaped
tube with two pistons. A force of 100 N is
exerted on the small piston, which has an area of
1 cm2. What is the total force on the other
piston if it has an area of 50 cm2?
24
5,000 N
25
13. ___ is a scientific rule that explains
hydraulic systems.
26
PASCALS
27
14. A ___ system multiplies a force by
transmitting it to a large surface area.
28
HYDRAULIC
29
15. An hydraulic system multiplies ___.
30
FORCE
31
16. The power steering system on a car is an
example of a ___ system.
32
HYDRAULIC
33
17. Buoyant forces act in a(n) ___ direction.
34
UPWARD
35
18. A buoyant force causes a(n) ___ force acting
upward on a submerged object.
36
NET
37
19. If an object floats, the volume of displaced
water is ___ the volume of the portion of the
object that is submerged.
38
EQUAL TO
39
20. ___ states that the buoyant force on an
object is equal to the weight of the fluid
displaced by the object.
40
ARCHIMEDES PRINICPLE
41
21. ___ states that the pressure exerted by a
moving stream of fluid is less than the pressure
of the surrounding fluid.
42
BERNOULLIS PRINCIPLE
43
22. If the density of an object is ___ the
density of the fluid in which it is immersed, the
object neither rises nor sinks but instead floats
at a constant level.
44
EQUAL TO
45
23. Place the following substances in order of
decreasing density from greatest to least
aluminum, lead, nickel and plastic.
46
LEAD, NICKEL, ALUMINUM, PLASTIC
47
24. A submarines density ___ when it takes in
water.
48
INCREASES
49
25. A ship stays afloat as long as the buoyant
force is ___ than the ships weight.
50
GREATER
51
26. The pressure exerted by a moving stream of
fluid is ___ than the pressure of the surrounding
fluid.
52
LESS
53
27. The mass per unit volume of a substance is
its ___.
54
DENSITY
55
28. Smoke rises up a chimney partly because of
___.
56
BERNOULLIS PRINICPLE
57
29. ___ principle helps to explain flight.
58
BERNOULLIS
59
30. Air pressure decreases as elevation ___.
60
INCREASES
61
31. A pascal is one ___ per square meter.
62
NEWTON
63
32. The pressure resulting from a force of 250 N
exerted over an area of 5 m2 is ___ Pa.
64
50
65
33. Water pressure increases with ___.
66
DEPTH
67
34. A mountain climber might carry oxygen because
the air pressure at the top of the mountain is
___ than the air pressure at the bottom.
68
LOWER
69
35. The pressure inside an air mattress ___ the
pressure caused by your weight when you lie on it.
70
BALANCES
71
36. The pressure of the air inside a bubble
submerged in water is ___ to the pressure of the
surrounding water.
72
EQUAL
73
37. When force is applied to a confined fluid, an
increase in pressure is transmitted ___ to all
parts of the fluid.
74
EQUALLY
75
38. When you squeeze one end of an inflated
balloon, the other end bulges out. This behavior
is an example of ___ principle.
76
PASCALS
77
39. In a hydraulic device, the surface area of
the small piston is 10 cm2 and the surface area
of the large piston is 100 cm2. To lift a 500-N
barrel placed on the large piston, you must apply
a force of ___ to the small piston.
78
50 N
79
40. In order to move, a sea star uses a natural
___ system called the water vascular system by
contracting different muscles to change the
pressure in the fluid of its tube feet.
80
HYDRAULIC
81
41. A ___ force acts on a submerged object
because the upward pressure on the bottom of the
object is greater than the downward pressure on
the top of the object.
82
NET
83
42. Because the buoyant force on a ship in fresh
water is less than the buoyant force in salt
water, it floats ___ in salt water than in fresh
water.
84
HIGHER
85
43. A block of wood is placed in a jar of water.
According to ___ principle, the buoyant force on
the block is equal to the weight of the displaced
fluid.
86
ARCHIMEDES
87
44. The greater the portion of a tennis ball
beneath the surface of a liquid, the ___ the
buoyant force on the ball.
88
GREATER
89
45. Chocolate syrup ___ in milk because chocolate
syrup is more dense than milk.
90
SINKS
91
46. The pressure you exert on the floor decreases
when you stand flatly on both feet because the
area on which you exert force increases.
92
TRUE
93
47. The air pressure at an altitude of 3 km is
greater than the air pressure at 1 km.
94
FALSE, LESS
95
48. Air enters your lungs when you inhale because
the pressure inside your lungs and the pressure
outside are balanced.
96
FALSE, UNBALANCED
97
49. Your heart, squeeze bottles, and medicine
droppers work on Archimedes principle.
98
FALSE, PASCALS
99
50. Hydraulic systems use two pistons with
different masses to lift heavy objects.
100
FALSE, SURFACE AREAS
101
51. More force is required to lift an object in
water than on land because the buoyant force of
the water.
102
FALSE, LESS
103
52. The volume of liquid displaced by a floating
cork is less than the volume of the object.
104
TRUE
105
53. As a ship is loaded, it sits lower in the
water because the density of the ship and its
cargo increases.
106
TRUE
107
54. Wind blowing across the top of a chimney
helps to draw air up the chimney. This is an
example of Archimedes principle.
108
FALSE, BERNOULLS
109
55. As an airplane wing moves, air moves faster
below the wing than above it.
110
FALSE, ABOVE
111
56. A wooden block floats both in water, which
has a density of 1.0 g/cm3, and in mercury, which
has a density of 13.6 g/cm3. Less of the wooden
block will be submerged in the ___.
112
MERCURY
113
57. According to ___ principle, the pressure in a
moving stream of fluid is lower than the pressure
of the surrounding fluid.
114
BERNOULLS
115
58. During high winds, the windows in a building
may bulge outward because the air pressure inside
the building is ___ than the air pressure outside
the building.
116
GREATER
117
59. Perfume is released from an atomizer when
squeezing the bulb makes the pressure at the top
of the tube ___ than the pressure at the bottom.
118
LOWER
119
60. A bat can glide through the air on a windy
night thanks in part to ___ principle.
120
BERNOULLIS
121
(No Transcript)