Title: Snowshoes enable a person to walk on deep snow because the snowshoes increase the ___ over which the
1Snowshoes enable a person to walk on deep snow
because the snowshoes increase the ___ over
which the persons weight is distributed.
2AREA
302. ___ can be measured in units of newtons per
square centimeter.
4PRESSURE
503. The pascal is a unit of ___.
6PRESSURE
704. A substance whose shape can easily change is
a(n) ___.
8FLUID
905. ___ pressure is the total force exerted by
the fluid divided by the area over which the
force is exerted.
10FLUID
1106. Air pressure exerted equally on an object
from different directions is ___ pressure.
12BALANCED
1307. 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.
14BALANCES
1508. Air pressure decreases as ___ increases.
16ELEVATION, ALTITUDE
1709. Water pressure ___ as depth increases.
18INCREASES
1910. The pressure in the deepest parts of the
ocean is roughly how many times the usual air
pressure you experience?
201,000
2111. Pascals principle deals with ___ substances.
22FLUID
2312. 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?
245,000 N
2513. ___ is a scientific rule that explains
hydraulic systems.
26PASCALS
2714. A ___ system multiplies a force by
transmitting it to a large surface area.
28HYDRAULIC
2915. An hydraulic system multiplies ___.
30FORCE
3116. The power steering system on a car is an
example of a ___ system.
32HYDRAULIC
3317. Buoyant forces act in a(n) ___ direction.
34UPWARD
3518. A buoyant force causes a(n) ___ force acting
upward on a submerged object.
36NET
3719. If an object floats, the volume of displaced
water is ___ the volume of the portion of the
object that is submerged.
38EQUAL TO
3920. ___ states that the buoyant force on an
object is equal to the weight of the fluid
displaced by the object.
40ARCHIMEDES PRINICPLE
4121. ___ states that the pressure exerted by a
moving stream of fluid is less than the pressure
of the surrounding fluid.
42BERNOULLIS PRINCIPLE
4322. 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.
44EQUAL TO
4523. Place the following substances in order of
decreasing density from greatest to least
aluminum, lead, nickel and plastic.
46LEAD, NICKEL, ALUMINUM, PLASTIC
4724. A submarines density ___ when it takes in
water.
48INCREASES
4925. A ship stays afloat as long as the buoyant
force is ___ than the ships weight.
50GREATER
5126. The pressure exerted by a moving stream of
fluid is ___ than the pressure of the surrounding
fluid.
52LESS
5327. The mass per unit volume of a substance is
its ___.
54DENSITY
5528. Smoke rises up a chimney partly because of
___.
56BERNOULLIS PRINICPLE
5729. ___ principle helps to explain flight.
58BERNOULLIS
5930. Air pressure decreases as elevation ___.
60INCREASES
6131. A pascal is one ___ per square meter.
62NEWTON
6332. The pressure resulting from a force of 250 N
exerted over an area of 5 m2 is ___ Pa.
6450
6533. Water pressure increases with ___.
66DEPTH
6734. A mountain climber might carry oxygen because
the air pressure at the top of the mountain is
___ than the air pressure at the bottom.
68LOWER
6935. The pressure inside an air mattress ___ the
pressure caused by your weight when you lie on it.
70BALANCES
7136. The pressure of the air inside a bubble
submerged in water is ___ to the pressure of the
surrounding water.
72EQUAL
7337. When force is applied to a confined fluid, an
increase in pressure is transmitted ___ to all
parts of the fluid.
74EQUALLY
7538. When you squeeze one end of an inflated
balloon, the other end bulges out. This behavior
is an example of ___ principle.
76PASCALS
7739. 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.
7850 N
7940. 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.
80HYDRAULIC
8141. 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.
82NET
8342. 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.
84HIGHER
8543. 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.
86ARCHIMEDES
8744. The greater the portion of a tennis ball
beneath the surface of a liquid, the ___ the
buoyant force on the ball.
88GREATER
8945. Chocolate syrup ___ in milk because chocolate
syrup is more dense than milk.
90SINKS
9146. The pressure you exert on the floor decreases
when you stand flatly on both feet because the
area on which you exert force increases.
92TRUE
9347. The air pressure at an altitude of 3 km is
greater than the air pressure at 1 km.
94FALSE, LESS
9548. Air enters your lungs when you inhale because
the pressure inside your lungs and the pressure
outside are balanced.
96FALSE, UNBALANCED
9749. Your heart, squeeze bottles, and medicine
droppers work on Archimedes principle.
98FALSE, PASCALS
9950. Hydraulic systems use two pistons with
different masses to lift heavy objects.
100FALSE, SURFACE AREAS
10151. More force is required to lift an object in
water than on land because the buoyant force of
the water.
102FALSE, LESS
10352. The volume of liquid displaced by a floating
cork is less than the volume of the object.
104TRUE
10553. As a ship is loaded, it sits lower in the
water because the density of the ship and its
cargo increases.
106TRUE
10754. Wind blowing across the top of a chimney
helps to draw air up the chimney. This is an
example of Archimedes principle.
108FALSE, BERNOULLS
10955. As an airplane wing moves, air moves faster
below the wing than above it.
110FALSE, ABOVE
11156. 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 ___.
112MERCURY
11357. According to ___ principle, the pressure in a
moving stream of fluid is lower than the pressure
of the surrounding fluid.
114BERNOULLS
11558. 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.
116GREATER
11759. 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.
118LOWER
11960. A bat can glide through the air on a windy
night thanks in part to ___ principle.
120BERNOULLIS
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