Forces and motions review

When is friction needed during the course of motion?

• to speed up motion

• to slow down motion

• to keep motion at the same speed

• to keep motion in the same direction

Miguel sorted objects he wanted to recycle into two similar boxes. He filled Box 1 with empty bottles and Box 2 with newspapers. He pushed both boxes across the floor. Miguel used more force to push Box 2 than Box 1.

• Box 2 was taller than Box 1.

• Box 2 was heavier than Box 1.

• Box 2 had stronger sides than Box 1.

• Box 2 contained more objects than Box 1.

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A ball is kicked and rolls for a long distance across a field. Which eventually causes the ball to slow and stop?

• friction

• gravity

• motion

• position

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James and Alex are kicking a ball back and forth. Alex kicks the ball in James’s direction, but the ball stops just before it reaches James. Which most likely caused the ball to stop?

• friction

• gravity

• change in mass of the ball

• change in shape of the ball

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NGSS.MS-PS2-2

A student compares the amount of force used by his classmates to push a toy car down a ramp. What would be the best way to compare this force?

• Measure the distance each time the car comes to a stop.

• Measure the amount of time it takes the car to travel down the ramp.

• Measure the distance the car travels with each push.

• Measure the amount of time it takes for the car to come to a stop.

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NGSS.MS-PS2-2

How does motor oil help to keep a car’s engine from getting too hot?

• by reducing friction

• by increasing magnetic attraction

• by lowering the temperature of the air under the hood

• by lowering the boiling point of water in the radiator

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Four different students take turns pushing a large, heavy ball on the school parking lot. What is the best way to determine which student used the most force to push the ball?

• compare the sizes of the students

• compare the ages of the students

• compare the distances that the ball rolled

• compare the number of times the ball was rolled

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When Anna tells her father that her bicycle is hard to pedal, he oils the chain. How does this make her bike easier to ride?

• Friction on the bike has increased.

• Friction on the bike has decreased.

• . Gravity on the bike has increased

• Gravity on the bike has decreased.

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NGSS.MS-PS2-2

A ball rolled toward Manny while he was playing soccer. If Manny’s foot kicks the ball as shown in the picture, which will most likely happen to the ball?

• The ball will stop rolling.

• The ball will roll toward the east.

• The ball will continue rolling west.

• The ball will go straight up in the air.

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Which best describes the force of gravity?

• A pulling force

• A pushing force

• a change in mass

• a change in speed

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