Force and Motion 1 (Introduction to Force and Motion)

How does friction affect speed?

• more friction decreases speed

• more friction increases speed

• less friction decreases speed

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Force and Motion

Which will most likely increase friction on snow-covered highways?

• oil

• salt

• sand

• water

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Force and Motion

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 comes down.

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

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Force and Motion

Which best explains why a ball increases in speed as it rolls down a hill?

• The ball increases in speed because of friction.

• The ball increases in speed because of gravity.

• The ball increases in speed because the mass changes.

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Force and Motion

Michael is using the balls above for an experiment. He kicks the two balls with the same amount of force and thinks the heavier ball will go farther. Is he correct?

• No, he is incorrect because the lighter ball has less mass, so it is affected more by gravity.

• Yes, he is correct because the heavier ball has more mass, so it is affected less by friction.

• No, he is incorrect because the lighter ball has less mass, so it will travel farther.

• Yes, he is correct because the heavier ball has more mass, so it will move farther.

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Force and Motion

Which best describes how Larry can increase the speed of his race car?

• by decreasing the mass of the car

• by increasing the mass of the car

• by increasing the force of friction

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Force and Motion

A student uses a rubber band 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 fastest when launched?

• paper clip

• piece of paper

• eraser

• rubber ball

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Force and Motion

A weight, suspended from a pole, is held in place as shown. When the weight is released, it moves in the direction shown. Which of these would cause the weight to move in this direction?

• electric force

• magnetic force

• friction

• gravity

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Force and Motion

Ari had one ball and two ramps. The ramps were identical except that one had a sandpaper surface and one had a plastic surface. Ari measured how long it took the ball to roll down each ramp. Ari MOST likely was investigating the effect of which force on the speed of the ball?

• electricity

• friction

• gravity

• magnetism

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Force and Motion

Jim played ice hockey with his friends. When he hit the puck, it stopped before reaching the goal. Which most likely caused this to happen?

• mass

• friction

• gravity

• momentum

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Force and Motion