Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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If you increase the force on a box, it will have
A. | greater inertia. | B. | less inertia. | C. | greater
acceleration. | D. | less acceleration. |
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2.
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The strength of the gravitational force between objects depends on
A. | mass and distance. | B. | pressure and area. | C. | mass and
volume. | D. | force and acceleration. |
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3.
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When one object exerts a force on another object, the second object exerts a
force back on the first object that is
A. | equal in size and opposite in direction. | B. | equal in size and in
the same direction. | C. | unequal in size and opposite in
direction. | D. | unequal in size and in the same direction. |
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4.
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Balanced forces act on
A. | two different objects. | B. | the same object. | C. | balanced
objects. | D. | unbalanced objects. |
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5.
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Centripetal force keeps an object moving in a circle. This force points
A. | toward the center of the circle. | B. | toward the outer edge of the
circle. | C. | to the right of the center of the circle. | D. | away from the circle
in all directions. |
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6.
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If a 50 kg racer in a 25 kg soapbox car is pushed with a force of 150 N, what
will be the racer’s acceleration?
A. | 2 m/s/s | C. | 6 m/s/s | B. | 3 m/s/s | D. | 11,250 m/s/s |
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7.
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You sit down in a chair to watch your favorite television show. The action force
is your weight pushing down on the chair. What is the reaction force?
A. | air pressing on your body from all sides. | B. | the chair pushing up
on your body. | C. | the muscles of your legs pushing against the legs of the chair. | D. | the back of the
chair supporting your back. |
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8.
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A push or pull is called
A. | motion. | B. | force. | C. | acceleration. | D. | velocity. |
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9.
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You push two chairs in a straight line with the same force. One chair is more
massive than the other. The more massive chair will have
A. | greater acceleration. | B. | less acceleration. | C. | greater centripetal
force. | D. | less centripetal force. |
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10.
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Janet is sliding a box across the floor. What does she need to know to calculate
the force on the box?
A. | mass and inertia | B. | acceleration and friction | C. | mass and
acceleration | D. | friction and gravity |
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11.
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Inertia is the resistance of an object to a change in its
A. | gravity | B. | motion | C. | mass | D. | balanced force |
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12.
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Action/reaction force pairs act on
A. | two different objects. | B. | the same object. | C. | balanced
objects. | D. | unbalanced objects. |
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13.
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A soccer player kicks a ball that is at rest. What do you predict will
happen?
A. | The ball will not move. | B. | The ball will lose
momentum. | C. | The ball will accelerate in the direction opposite the applied
force. | D. | The ball will accelerate in the same direction as the applied
force. |
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14.
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Kelly slides a box from a carpeted floor onto a tile floor. The force she is
applying does not change. What do you predict will happen?
A. | The box will speed up because the amount of friction decreases. | B. | The box will
continue moving at the same rate because the amount of friction remains the same. | C. | The box will slow
down because the amount of friction increases. | D. | The box will stop moving because Kelly's
force will not be enough to overcome friction. |
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15.
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When you push on a door, the door pushes back with an equal and opposite force.
These two forces are known as
A. | mass and velocity force pairs | B. | unbalanced force pairs | C. | mass and
acceleration force pairs | D. | action/reaction force
pairs |
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16.
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Which of the following is an example of zero net force applied to an
object?
A. | a skier moving down a mountain with increasing speed | B. | a car turning left
without changing speed | C. | a ball being hit into the outfield with a
bat | D. | a rope pulled equally from opposite ends |
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17.
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If one force is balanced by another force, the
A. | effect is the same as no force at all. | B. | effect is a positive net
force. | C. | size of the first force is balanced by the direction of the second
force. | D. | direction of the first force is balanced by the size of the second
force. |
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18.
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A boy pushes a shopping cart with a force of 10 N, and the cart accelerates 2
m/s/s. What is the mass of the cart?
A. | 0.2 kg | B. | 2.5 kg | C. | 5
kg | D. | 20 kg |
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19.
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Newton's first law describes the tendency of objects to resist a change in
motion. This resistance is also called
A. | inertia. | B. | net force. | C. | friction. | D. | gravity. |
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20.
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One way to decrease acceleration is to
A. | decrease force and mass equally. | B. | increase force more than
mass. | C. | increase mass. | D. | decrease mass. |
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21.
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Sebastian lifts his book off the floor. Which of the following vector
arrow combinations best represent the forces acting on the book?
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22.
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What units are used to measure force?
A. | kilograms | B. | meters/s/s | C. | seconds | D. | newtons |
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23.
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The force that attracts two masses to each other is called
A. | air resistance. | B. | friction. | C. | gravity. | D. | pressure. |
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24.
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A girl pulls a wheeled backpack with a force of 3 N. If the backpack has a
mass of 6 kg, what is its acceleration?
A. | 0.5 m/s/s | B. | 2 m/s/s | C. | 18
m/s/s | D. | 20 m/s/s |
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25.
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A hollow plastic ball and a solid metal ball are dropped from the same height in
a vacuum. With no air resistance, gravity is the only force acting on the balls. What do you predict
will happen?
A. | The balls will fall at the same rate. | B. | The metal ball will fall
faster. | C. | The plastic ball will fall faster. | D. | The larger ball will fall
faster. |
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26.
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James combines all the forces acting on a tennis ball. He is finding the
A. | net force. | B. | inertia force. | C. | gravitational
force. | D. | frictional force. |
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27.
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A skater is moving at a constant speed. How can he increase his speed?
A. | drag the heel stop to increase friction | B. | lean to one side,
causing the skates to turn | C. | reduce the force with which he pushes his feet
against the ground | D. | increase the force with which he pushes his
feet against the ground |
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28.
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Roger is designing a new model rocket. He wants it to have as little air
resistance as possible. What should he do?
A. | decrease its surface area | B. | lower its temperature | C. | increase its
speed | D. | make its surface rougher |
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29.
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How much force is needed to accelerate a 0.149 kg baseball 3 m/s/s?
A. | 0.049 N | B. | 0.447 N | C. | 14.930
N | D. | 20.134 N |
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30.
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What is the net force of the object represented by the free body diagram
below?  A. | 0 N | B. | 15 N to the right | C. | 20 N
downward | D. | 25 N to the left |
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