Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1.
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Of the following, the greatest gravitational force would occur between
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a.
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a marble and a baseball 5 meters apart. |
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b.
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a loaded freighter on the high seas and Earth. |
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c.
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the moon and an astronaut standing on the moon. |
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d.
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the moon and Earth. |
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2.
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The law that states that every object maintains constant velocity unless acted on by an unbalanced force is
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a.
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Newton’s first law of motion. |
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b.
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Newton’s second law of motion. |
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c.
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Newton’s third law of motion. |
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d.
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the law of conservation of momentum. |
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3.
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The law that states that for every action force there is an equal and opposite reaction force is
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a.
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Newton’s first law of motion. |
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b.
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Newton’s second law of motion. |
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c.
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Newton’s third law of motion. |
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d.
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the law of conservation of momentum. |
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4.
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The law that states that the unbalanced force acting on an object equals the object’s mass times its acceleration is
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a.
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Newton’s first law of motion. |
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b.
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Newton’s second law of motion. |
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c.
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Newton’s third law of motion. |
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d.
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the law of conservation of momentum. |
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5.
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Which of the following equations is correct?
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a.
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w = mg |
c.
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w = g/m |
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b.
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w = m/g |
d.
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w = g + m |
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6.
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What is the approximate terminal velocity of a sky diver before the parachute opens?
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a.
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32 mi/h |
c.
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320 mi/h |
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b.
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32 km/h |
d.
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320 km/h |
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7.
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Earth pulls on the moon and holds the moon in its orbit. The moon pulls on Earth with an equal and opposite force. This is an example of
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a.
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Newton’s first law. |
c.
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Newton’s third law. |
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b.
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Newton’s second law. |
d.
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None of the above |
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8.
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What is the unbalanced force that slows down a ball rolling across the floor?
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a.
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the force of friction |
c.
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the force of inertia |
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b.
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the force of gravity |
d.
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the force of momentum |
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9.
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If two objects with different masses and traveling with different velocities collide, what law allows you to predict the motion of the objects after the collision?
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a.
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the law of conservation of momentum |
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b.
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the law of universal gravitation |
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c.
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Newton’s third law |
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d.
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Newton’s second law |
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10.
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Express the following as an equation: One newton is the force that can give an object with a mass of 1 kg an acceleration of 1 m/s2.
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a.
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1 N = 1 kg ÷ 1 m/s2 |
c.
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1 N = 1 m/s2 ÷ 1 kg |
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b.
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1 N ´ 1 kg = 1 m/s2 |
d.
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1 N = 1 kg ´ 1 m/s2 |
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11.
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When gravitational forces and air resistance equalize on an object that is falling toward Earth and the object stops accelerating, what is the velocity of an object called?
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a.
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resultant velocity |
c.
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instantaneous velocity |
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b.
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terminal velocity |
d.
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average velocity |
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12.
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In the absence of air resistance, how would the acceleration of a 1.5 kg book and the acceleration of a 15 kg rock differ if the objects were dropped from the same height?
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a.
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The book would accelerate twice as fast as the rock. |
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b.
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The rock would accelerate twice as fast as the book. |
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c.
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The book would accelerate ten times as fast as the rock. |
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d.
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They would not differ; they would be the same. |
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13.
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What happens immediately after a sky diver opens her parachute?
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a.
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Air resistance greatly increases. |
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b.
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The sky diver is in free fall. |
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c.
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The sky diver’s speed greatly increases. |
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d.
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The force of gravity greatly increases. |
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14.
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Which statement illustrates Newton’s first law?
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a.
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A stone will not move unless something pushes or pulls it. |
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b.
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A ball rolling across the floor eventually slows down. |
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c.
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As a car comes to a stop, the passengers continue to move forward. |
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d.
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All of the above |
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15.
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Which object has the greatest inertia?
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a.
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a tennis ball |
c.
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a beach ball |
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b.
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a bowling ball |
d.
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a volleyball |
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16.
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What force causes a skater sliding on the ice to gradually slow down?
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a.
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a balanced force |
c.
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friction |
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b.
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inertia |
d.
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acceleration |
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17.
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A seat belt helps you when your car stops suddenly by providing a(n)
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a.
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balanced forward force. |
c.
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balanced backward force. |
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b.
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unbalanced forward force. |
d.
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unbalanced backward force. |
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18.
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One newton is the force that can give a mass of 1 kg an acceleration of
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a.
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1 m/s. |
c.
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1 m/s2. |
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b.
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9.8 m/s. |
d.
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9.8 m/s2. |
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19.
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Which of the following will result in the greatest acceleration?
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a.
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56 N acting on a 1-kg box |
c.
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23 N acting on a 2-kg box |
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b.
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56 N acting on a 2-kg box |
d.
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23 N acting on a 5-kg box |
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20.
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What unbalanced force is needed to give a 976 kg vehicle an acceleration of 2.50 m/s2?
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a.
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3.90 ´ 102 N |
c.
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2.44 ´ 103 N |
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b.
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3.90 ´ 102 lb |
d.
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2.44 ´ 103 lb |
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21.
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If an equal force is applied to two cars of equal mass, Car A and Car B, Car A will have _____ acceleration as (than) Car B.
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a.
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the same |
c.
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less |
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b.
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greater |
d.
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the opposite |
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22.
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The gravitational force between two objects depends on masses of objects and
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a.
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accelerations of objects. |
c.
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speeds of objects. |
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b.
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distance between objects. |
d.
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sizes of objects. |
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23.
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Which of the following objects exerts a gravitational force?
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a.
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a bowling ball |
c.
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a feather |
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b.
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a book |
d.
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All of the above |
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24.
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Increasing which of these conditions results in more gravitational force between two objects?
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a.
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distance |
c.
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mass |
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b.
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acceleration |
d.
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surface area |
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25.
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When an object is in free fall, the only force acting on it is
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a.
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gravity. |
c.
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inertia. |
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b.
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friction. |
d.
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terminal velocity. |
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26.
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Free-fall acceleration near Earth’s surface
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a.
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depends on an object’s weight. |
c.
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depends on an object’s mass. |
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b.
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is the same for all objects. |
d.
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None of the above |
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27.
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How much does a 59.0 kg woman weigh on Earth?
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a.
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6.02 N |
c.
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145 lb |
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b.
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59.0 lb |
d.
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578 N |
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28.
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Orbital motion is a combination of
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a.
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mass and friction. |
c.
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acceleration and gravity. |
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b.
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forward motion and free fall. |
d.
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weight and vertical velocity. |
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29.
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Astronauts “float” when inside an orbiting spaceship because they are
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a.
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weightless. |
c.
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in free fall. |
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b.
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in a vacuum. |
d.
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outside Earth’s gravity. |
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30.
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Which is an example of projectile motion?
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a.
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a rolling bowling ball |
c.
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a balloon rising in the air |
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b.
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a dart thrown at a dart board |
d.
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a high-speed train accelerating |
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31.
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Whenever a force is exerted, another force occurs that is _____ in size, and _____ in direction.
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a.
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equal, same |
c.
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equal, opposite |
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b.
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smaller, same |
d.
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smaller, opposite |
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32.
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The force exerted on the racket by a hit tennis ball is the
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a.
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gravitational force. |
c.
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acceleration. |
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b.
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reaction force. |
d.
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action force. |
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33.
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Which statement about action-reaction force pairs is incorrect?
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a.
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They act on the same object. |
c.
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They occur at the same time. |
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b.
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They always occur in pairs. |
d.
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They are equal and opposite. |
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34.
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An object’s momentum is determined by the object’s
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a.
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weight and velocity. |
c.
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mass and velocity. |
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b.
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mass and acceleration. |
d.
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weight and acceleration. |
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35.
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Two identical cars are traveling at equal speeds. One is going north and the other south. If they collide head-on and stick together, what will happen to the motion of the cars?
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a.
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Both cars will move north. |
c.
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Both cars will move south. |
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b.
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Both cars will move east. |
d.
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Both cars will stop. |
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36.
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What is the momentum of a 255 g apple falling at 16.0 m/s?
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a.
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4.08 m/s2 downward |
c.
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15.9 m/s2 downward |
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b.
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4.08 kg • m/s downward |
d.
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15.9 kg • m/s downward |
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37.
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Which of the following has a momentum of zero?
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a.
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a newspaper lying on a table |
c.
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a leaf falling to the ground |
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b.
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a plane flying through the air |
d.
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All of the above |
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38.
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When a moving bowling ball hits a pin, some of the ball’s momentum
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a.
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doubles in force. |
c.
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is transferred to the pin. |
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b.
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increases the pin’s mass. |
d.
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is lost. |
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39.
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How does the total momentum of two objects before a collision compare with the total momentum after the collision?
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a.
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It is the same. |
c.
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It is equal to zero |
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b.
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It is less. |
d.
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It is greater. |
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40.
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A 10.0 kg dog chasing a rabbit north at 6.0 m/s has a momentum of
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a.
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0.6 kg m/s. |
c.
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60.0 m/s. |
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b.
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60.0 kg m/s north. |
d.
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60.0 kg/s. |
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41.
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When the velocity of an object changes, it is acted upon by a(n)
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a.
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force. |
c.
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momentum. |
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b.
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inertia. |
d.
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deceleration. |
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42.
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If the net force on an object is zero, then the object has
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a.
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reaction forces. |
c.
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balanced forces. |
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b.
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action forces. |
d.
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unbalanced forces. |
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43.
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When objects are moved further apart from each other, the force of gravity between them
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a.
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increases. |
c.
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decreases. |
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b.
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stays the same. |
d.
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decreases at first then increases. |
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44.
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The SI unit of force, named after the scientist who described the relationship between motion and force, is called the
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a.
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newton. |
c.
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curie. |
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b.
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einstein. |
d.
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pasteur |
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45.
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When air resistance balances the weight of a falling object, the velocity
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a.
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slowly decreases. |
c.
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rapidly increases. |
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b.
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remains constant. |
d.
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None of the above |
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46.
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The weight of an object can be calculated by multiplying mass by
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a.
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distance. |
c.
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velocity. |
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b.
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speed. |
d.
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free-fall acceleration. |
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47.
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Which object does not have momentum?
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a.
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a fish swimming in a pond |
c.
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a rock by the side of the road |
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b.
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a feather falling to the ground |
d.
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a boulder rolling down a hill |
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48.
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What is the reaction force when you place a cup on a table?
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a.
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the force of the cup on the table |
c.
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the force of gravity on the table |
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b.
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the force of the table on the cup |
d.
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the force of gravity on the cup |
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49.
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Which of the following is not a factor in calculating momentum?
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a.
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mass |
c.
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acceleration |
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b.
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direction |
d.
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speed |
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50.
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Whenever an object is standing still, which value is always zero?
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a.
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speed |
c.
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momentum |
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b.
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velocity |
d.
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All of the above |
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51.
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A tug-of-war that results in one team pulling the other across the line is an example of
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a.
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action forces. |
c.
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balanced forces. |
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b.
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reaction forces. |
d.
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unbalanced forces. |
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52.
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A force is continuously applied to an object, causing it to accelerate. After a period of time, however, the object stops accelerating. What conclusions can be drawn?
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a.
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The mass of the object has increased. |
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b.
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Gravity on the object has increased. |
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c.
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The object is experiencing some kind of friction. |
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d.
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The momentum of the object has reached a maximum. |
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53.
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Weight is best described as
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a.
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an object’s resistance to acceleration. |
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b.
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what causes an object to fall. |
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c.
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the downward force exerted on an object due to gravity. |
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d.
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a force solely dependent on an object’s mass. |
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54.
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Which of the following units is used to measure acceleration?
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a.
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m/s |
c.
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m/s2 |
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b.
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m s |
d.
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m2/s2 |
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55.
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Which of the following is true?
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a.
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Weight and mass are proportional but not equal. |
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b.
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Weight is gravitational force an object experiences due to its mass. |
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c.
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The weight of an object on Earth is greater than the weight of the same object on the moon, but the object’s mass stays the same. |
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d.
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All of the above |
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56.
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The tendency of an object at rest to remain at rest is
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a.
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inertia. |
c.
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free fall. |
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b.
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momentum. |
d.
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acceleration. |
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57.
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Near Earth’s surface, the strongest gravitational force would occur between an elephant and
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a.
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the sun. |
c.
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a cat. |
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b.
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the moon. |
d.
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Earth. |
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58.
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Near Earth’s surface, an object’s free-fall acceleration increases as its
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a.
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mass increases. |
c.
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speed increases. |
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b.
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weight increases. |
d.
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None of the above |
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