11/16/2022 Unit 3 review

Kyle is riding his bicycle. He works very hard to reach the top of a hill and then coasts down the other

side. Which statement best explains why Kyle does NOT need to work as hard when he travels

downhill?

• Potential energy is converted to kinetic energy as he moves downhill.

• Kinetic energy is stored in the bicycle.

• No energy is lost as heat when Kyle rides downhill

• There is less friction between the road and the bike as it moves downhill.

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The picture below shows a train as it approaches a hill. This train can only make it over the hill if it approaches at its top speed because it will lose speed as it

climbs.

What changes are taking place in the train's potential and kinetic energy as it climbs the hill?

• Kinetic energy is decreasing

• Potential is decreasing

• kinetic energy is increasing

• Potential energy is increasing

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Bob was blowing up balloons for a party. Just for fun, he blew up one balloon and let it go instead of

tying it off. What energy transformation did he observe

• kinetic - sound

• Kinetic-chemical

• potential-kinetic

• potential-thermal

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Wind, moving water, falling rocks, and roller-skating children are all examples of —

• atomic energy.

• potential energy.

• chemical energy.

• kinetic energy.

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An old trick to determine an approximate distance to a storm is to count the number of seconds it

takes to hear a peal of thunder after seeing a lightning bolt and divide that number by 5 to get the

number of miles to the storm. If it takes 15 seconds for thunder to reach an observer 3 miles away,

about how fast is the sound of the thunder traveling in miles per second to the nearest tenth?

• 0.5

• 5.0

• 0.2

• 2.0

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Phil is riding his bike to his friend's house, which is 5 kilometers away. He leaves his

house at 3:00 p.m. and arrives at his friend's house at 3:30 p.m. At what speed, in

kilometers per hour, was Phil traveling?

A block is pulled 0.90 m to the right in 2.5 s. What is the block’s average speed to the nearest hundredth of a m/s?

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Jean-Paul is racing in the Tour de France bicycle race. He is moving along rapidly at a speed of 15

kilometers per hour. Suddenly, a strong wind begins to blow into his face. Jean-Paul cannot exert any

more force on the pedals. What will happen to Jean-Paul's speed while the wind continues to blow

against him?

• His speed will decrease since the wind is blowing towards him.

• His speed will increase due to stronger wind currents.

• His speed will double due to the second force being applied.

• His speed will remain the same as he is applying the same force to the pedals.

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The diagram shows an investigation in a science classroom. Students pull the same mass up an inclined

plane propped up on five blocks, then six, seven, and eight blocks. Each time, they use a spring scale to

measure the force needed to pull the mass up the inclined plane.

This investigation can show how which of the following affects the force needed to move an object up

an inclined plane?

• The mass of the object

• The height of the inclined plane

• The length of the inclined plane

• The surface area of the object

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The speed of an object over time is shown in the graph. Which table describes the object’s motion?

• 
• 
• 
• 

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