Mechanical Energy Test

When you put on the brakes of a bicycle, friction causes some of the mechanical energy to transfer to thermal energy.

• True

• False

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NGSS.MS-PS3-5

According to the law of conservation of energy, energy can be created or destroyed.

• True

• False

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NGSS.MS-PS3-5

NGSS.MS-PS3-4

In every energy transformation, some energy is always “lost” as ____ energy.

• chemical

• radient

• electrical

• thermal

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NGSS.MS-PS3-4

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According to the law of conservation of energy, the total amount of energy in the universe ____.

• remains constant

• changes constantly

• decreases

• increases

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Work _____ energy.

• reduces

• reflects

• transfers

• stops

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NGSS.MS-PS3-5

Which equation is correct?

• mechanical energy = kinetic energy – potential energy

• mechanical energy = potential energy – kinetic energy

• mechanical energy = kinetic energy + potential energy

• mechanical energy = kinetic energy × potential energy

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

When two surfaces interact, some mechanical energy leaves the system as thermal energy due to ________.

• surrounding heat

• water

• friction

• fusion

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NGSS.MS-PS3-5

NGSS.MS-PS1-4

Which of the following does NOT reduce friction?

• grease

• cotton

• oil

A fire warms you by transferring ___ energy.

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NGSS.MS-PS1-4

NGSS.MS-PS3-3

Katie conducted three trials of rolling a 5-kilogram ball down 10 steps at her school. Later, her class used the data she collected about the mass of the ball, the height of the stairs, and the gravitational constant to calculate the potential energy of the ball. The graph shows the students’ calculations for the ball at each step of the stairway.

a. Create a claim about how kinetic energy and potential energy can change as a ball rolls down a set of steps.

b. Describe the evidence that supports the claim from part (a).

This should be written in paragraph form.

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

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