Forces and Motion Review

Of the following, the greatest gravitational force would occur between which?

• a marble and a baseball 5 meters apart.

• a loaded freighter on the high seas and Earth

• the moon and an astronaut standing on the moon

• the moon and Earth

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The law that states that for every action force there is an equal and opposite reaction force is which?

• Newton’s first law of motion.

• Newton’s second law of motion

• Newton’s third law of motion

• the law of conservation of momentum

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What is the unbalanced force that slows down a ball rolling across the floor?

• friction

• gravity

• inertia

• momentum

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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?

• the law of conservation of momentum

• the law of universal gravitation

• Newton’s third law

• Newton’s second law

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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?

• resultant velocity

• terminal velocity

• instantaneous velocity

• average velocity

n 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?

• The book would accelerate twice as fast as the rock.

• The rock would accelerate twice as fast as the book.

• The book would accelerate ten times as fast as the rock.

• They would not differ; they would be the same.

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What happens immediately after a sky diver opens her parachute?

• Air resistance greatly increases.

• The sky diver is in free fall.

• The sky diver’s speed greatly increases.

• The force of gravity greatly increases.

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Which statement illustrates Newton’s first law?

• A stone will not move unless something pushes or pulls it.

• A ball rolling across the floor eventually slows down.

• As a car comes to a stop, the passengers continue to move forward

• All of the above

Which object has the greatest inertia?

• a tennis ball

• a bowling ball

• a beach ball

• a volleyball

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One newton is the force that can give a mass of 1 kg an acceleration of what? (check the units)

• 1 m/s.

• 1 m/s/s.

• 9.8 m/s/s

• 9.8 m/s

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