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1.
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Buoyant force makes an object feel heavier.
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2.
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Fluid pressure results from the motion of the atoms or molecules that make up
the fluid.
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3.
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As you rise higher into the atmosphere, the air pressure decreases.
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4.
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Pressure is force per unit of area.
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5.
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As you go deeper under water, pressure decreases.
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6.
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You can determine the buoyant force on an object if you know the weight of the
container in which it is floating.
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7.
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The braking system of a car is an example of a hydraulic device.
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8.
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If an object with a density of 3 grams per cubic centimeter is dropped into a
liquid with a density of 5 grams per cubic centimeter, the object will
A. | flink. | B. | remain at a constant level. | C. | sink. | D. | float. |
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9.
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If the buoyant force on an object in water is greater than the object’s
weight, the object will
A. | hoover beneath the surface of the water. | B. | be crushed by the
water pressure. | C. | rise to the surface. | D. | sink. |
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10.
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A substance whose shape can easily change and that flows is a
A. | powder. | B. | solid. | C. | fluid. | D. | metal. |
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11.
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What scientific rule states that the buoyant force on an object is equal to the
weight of the fluid displaced by the object?
A. | Bernoulli’s principle | B. | Pascal’s principle | C. | Newton’s third
law of motion | D. | Archimedes’ principle |
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12.
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The operation of a hydraulic car lift can be best explained using
A. | Newton’s third law. | B. | Bernoulli’s
principle. | C. | Archimedes’ principle. | D. | Pascal’s
principle. |
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13.
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If an object with a density of 2 grams per cubic centimeter is dropped into a
fluid with a density of 2 grams per cubic centimeter, the object will
A. | sink to the bottom. | B. | dissolve. | C. | remain at a constant
level in the fluid. | D. | sink then float at the surface of the
fluid. |
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14.
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Much of the lift that enables an airplane to fly can be best explained
using
A. | Pascal’s principle. | B. | Bernoulli’s
principle. | C. | Archimedes’ principle. | D. | Newton’s first
law. |
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15.
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In a confined fluid, additional pressure is transmitted
A. | only opposite to the direction of an applied force. | B. | opposite to buoyant
force. | C. | downward only. | D. | equally in all directions throughout the
fluid. |
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16.
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Bernoulli’s principle helps to explain
A. | flight. | B. | momentum. | C. | hydraulic
brakes. | D. | buoyancy. |
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17.
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An SI (metric) unit of pressure is called a ___________ and is equal to
_____________.
A. | bernoulli, 1 Newton per sqare centimeter | B. | pound, 1
pascal per square kilometer | C. | pascal, 1 Newton per square
meter | D. | meter. 2 pounds per square inch |
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18.
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Given that the air pressure outside your body is so great, why aren’t you
crushed?
A. | Pressure inside your body balances the air pressure outside your
body. | B. | Earth’s gravity cancels out the air pressure. | C. | Inertia changes the
pressure before it comes into contact with you. | D. | Human skin is extremely
strong. |
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19.
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The mass per unit volume of a substance is its
A. | fluid pressure. | B. | density. | C. | weight. | D. | buoyancy. |
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20.
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Which of these multiplies a force by transmitting it to a large surface
area?
A. | a buoyant force | B. | a force pump | C. | a balanced
pressure | D. | a hydraulic system |
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21.
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Which type of substance does Pascal’s principle deal with?
A. | fluids | B. | powders | C. | solids | D. | metals |
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22.
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According to Bernoulli’s principle, the pressure exerted by a moving
stream is __________ the pressure exerted by the same fluid when it is not moving.
A. | greater than | B. | equal to | C. | higher
than | D. | less than |
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23.
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Snowshoes enable a person to walk on deep snow because the snowshoes
A. | increase the buoyancy of the person. | B. | decrease the person’s weight on the
snow. | C. | increase the area over which the person’s weight is
distributed. | D. | increase the pressure on the snow. |
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24.
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If the density of an object is equal to the density of the fluid in which it is
immersed,
A. | the object rises. | B. | the object neither rises nor sinks but instead
floats at a constant level. | C. | the object sinks. | D. | the object will
sink, then rise, then keep repeating this cycle. |
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25.
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A rock will sink in water because
A. | it has a small buoyant force on it. | B. | its density is less than that of
water. | C. | its density is greater than that of water. | D. | it is very
heavy. |
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26.
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Fluid pressure is the total force exerted by the fluid divided by
A. | the gravitational pull within the fluid. | B. | water pressure or
depth. | C. | the area over which the force is exerted. | D. | the acceleration of
the force. |
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27.
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Pressure can be measured in units of
A. | Newtons per cubic centimeter | B. | Newtons per square
centimeter | C. | Newtons per centimeter | D. | Newtons |
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28.
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A hydraulic device consists of a U-shaped tube with two pistons. A force of 50 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 20 cm2?
A. | 10 N | B. | 1 N | C. | 1,000
N | D. | 100 N |
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29.
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If an object floats, the volume of displaced water is equal to the volume
of
A. | the portion of the object that is submerged. | B. | exactly half of the
object. | C. | the portion of the object that is above water. | D. | the entire
object. |
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30.
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A ship stays afloat as long as the buoyant force is
A. | less than the ship’s speed. | B. | greater than the ship’s
weight. | C. | less than the ship’s weight. | D. | greater than the ship’s
speed. |
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31.
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What does a negative acceleration mean?
A. | The object is not moving. | B. | The object is slowing down. | C. | The object is
speeding up. | D. | The object is moving at a constant speed. |
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32.
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A person driving a car on an icy road finds it hard to turn or stop the car. The
car slides off the road, coming to rest against a large tree which stops its motion. Identify the
forces at work here, and explain how each affects the car’s motion.
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Use this diagram for the following questions: 
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33.
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In the diagram of the hydraulic system, the force exerted on the left piston is
10 N. What is the force exerted by the right piston?
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34.
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If the right piston were removed, this system in the diagram above would be an
example of a(n)
A. | force pump. | B. | hydraulic system. | C. | buoyant
force. | D. | pascal. |
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Use the diagram for the following questions: 
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35.
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Which point in the diagram represents the greatest air pressure?
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36.
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Which point in the diagram represents the least water pressure?
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37.
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Which ordering of points shows air pressure increasing (in order)?
A. | D, A, G, B | B. | B, G, A, D | C. | G, A, D,
B | D. | B, D, A, G |
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38.
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Pressure is equal to
A. | mass divided by volume. | B. | weight divided by force. | C. | mass times
gravity. | D. | force divided by area. |
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Use these 3 choices for the next 3 questions:
A. | Object’s density is equal to the density of the fluid it is
in. | B. | Object’s density is less than the density of the fluid it is
in. | C. | Object’s density is greater than the density of the fluid it is
in. |
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39.
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Object floats
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40.
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Object sinks
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41.
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Object floats at a constant level.
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