Force and Motion

Which best explains why a bicycle slows down when its brakes are applied?

• the breaks increase the force of gravity on the bicycle

• the brakes heat the rubber on the bicycle tires

• the brakes cause frictional forces on the wheels of the bicycle

• the brakes add energy to the bicycle

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A push or pull that causes an object to move, stop, or change direction.

• motion

• energy

• force

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Four solid balls, each with a different mass, are moving at the same speed. Which ball would require the most force to stop its motion?

• ball with a mass of 20 kg

• ball with a mass of 15 kg

• ball with a mass of 10 kg

• ball with a mass of 5 kg

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What causes a wagon to speed up when going down a hill?

• mass

• friction

• gravity

• air pressure

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A force is a ​ ​ (a)   or pull that can start, stop, or change the direction of an object's motion. 

• push

• pull

• force

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The more massive an object, the (a)   affect a certain force will have on the object.

• less

• more

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The main reason a baseball comes down when a boy tosses it up into the air is​ (a)    —

• Gravity pulling down

• Gravity pushing into the air

• magnetism pulling down

• magnetism pushing the ball

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Match the following descriptions with the correct terms.

• The action or process of moving or being moved

• gravity

• The force that attracts a body toward the center of the earth

• motion

• An element, feature, or factor that is liable to vary or change

• variable

• A push or pull on an object

• force

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A ball is kicked and rolls along a level field until it comes to a stop. What is most responsible for the ball coming to a stop?

• friction

• gravity

• mass

• air

A change in position

• movement

• energy

• stop

Tags

NGSS.MS-PS2-2