cloZing PS 7.2.1/7.2.2 Mini Unit Assessment

What is the pendulum’s mechanical energy at position 1?

• A. potential energy = 100%; kinetic energy = 0%

• B. potential energy = 25%; kinetic energy = 75%

• C. potential energy = 50%; kinetic energy = 50%

• D. potential energy = 75%; kinetic energy = 25%

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NGSS.MS-PS3-2

Which choice describes the law of conservation of energy?

• Energy created by machines is lost.

• Energy is created in the universe every day.

• Total energy in a system decreases over time.

• Potential energy is completely converted to kinetic energy.

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At what location will the cars have the highest potential energy?

• A. 1

• B. 2

• C. 4

• D. 6

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NGSS.MS-PS3-2

What happens to the energy of a ball rolling up a ramp as the ball slows down?

• Kinetic energy is lost and potential energy is created.

• Potential energy is destroyed and kinetic energy is created.

• Potential energy is increasing and kinetic energy is decreasing.

• Potential energy is decreasing and kinetic energy is increasing.

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What will happen to the energy of the roller coaster after it reaches the top of the hill?

• A. Its potential energy will be the greatest at Point Y.

• B. Its kinetic energy will be the greatest at Point W.

• C. Its potential energy will be changed into kinetic energy.

• D. Its kinetic energy will be changed into potential energy.

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The diagram below shows a pendulum. At which point(s) is potential energy at the maximum?

• at P only

• at N only

• at both M and N

• at both M and P

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NGSS.MS-PS3-2

Below is a diagram of five balls suspended from a bar. If all the balls are identical, which explains how energy will transfer from ball 1 when it is pulled back and then released?

• It will be transferred as kinetic to potential energy from ball 1 to potential energy at ball 5.

• It will be transferred as potential to kinetic energy from ball 1 to kinetic energy at ball 5.

• It will be transferred as potential energy from ball 1 to kinetic energy at ball 5.

• It will be transferred as kinetic energy from ball 1 to potential energy at ball 5.

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The diagram below shows a car on a roller coaster with four labeled locations. Between what two locations does the car’s kinetic energy transform into potential energy?

• A. W and X

• B. W and Y

• C. X and Y

• D. Y and Z

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The picture below demonstrates a pendulum in motion. The ball labeled X is the position where it is released. Which point has the most potential energy once the pendulum starts to swing?

• A. V

• B. W

• C. Y

• D. Z

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NGSS.MS-PS3-2

A toy car accelerated as it moved along a level track. The car’s speed increased from 5 meters per second to 10 meters per second. How did this change in speed affect the car’s mechanical energy?

• The car’s mechanical energy increased because its kinetic energy increased.

• The car’s mechanical energy decreased because its potential energy decreased.

• The car’s mechanical energy remained constant because its kinetic energy did not change.

• The car’s mechanical energy remained constant because its potential energy did not change.

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