Force and Motion

A student uses a rubber to launch the four objects shown in the table. If the student pulls the rubber band back the same amount each time, which object will most likely move the fasted when launched?

• paper clip

• piece of paper

• eraser

• rubber ball

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A wagon is pushed in a straight line. How would an increase in friction on the wagon wheels affect the wagon?

• It would cause the wagon to move faster

• It would cause the wagon to change mass.

• It would cause the wagon to change direction.

• It would cause the wagon to slow down.

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

• the breaks heat the rubber on the bicycle tires.

• the brakes add energy to the bicycle.

• the brakes increase the force of gravity on the bicycle

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

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NGSS.MS-PS2-2

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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 5 kg

• ball with a mass of 10 kg

• ball with a mass of 15 kg

• ball with a mass of 20 kg

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Match the following descriptions with the correct terms.

• A push or pull on an object

• variable

• The action or process of moving or being moved

• motion

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

• force

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

• gravity

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

• less

• more

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Which graph represents an object that is decreasing in speed?

• a

• b

• c

• d

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NGSS.MS-PS3-1

Which best describes the speed of a ball as it is thrown straight up into the air and comes back down?

• The ball goes up at a constant speed, stops, then comes down at a constant speed.

• The ball goes up at a constant speed, stops, and increases speed as it comes down.

• The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it goes down.

• The ball goes slower and slower as it goes up, stops, and then comes down at a constant speed.

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