Work, Energy, and Power

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Last updated 10:08 PM on 5/11/26
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10 Terms

1
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What is the Principle of Conservation of Energy?

Energy cannot be created or destroyed, it can only be transferred between different stores. The total amount of energy before a transfer is equal to the total amount after the transfer.

2
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Name 4 types of energy stores.

  • Gravitational potential

  • Kinetic

  • Thermal

  • Elastic potential

  • (chemical????)

3
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Give 3 ways energy can be transferred?

  • Radiation

  • Electrically

  • Mechanically

4
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What is work done?

  • A transfer of energy from one store to another.

  • Energy transferred when a force causes an object to move

5
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State the equation for work done when force and motion are in the same direction.

W = F s

6
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What is 1 joule?

The work done when a force of 1 N moves an object 1 m in the direction of the force

7
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State the equation for work done when the force acts at an angle to the direction of motion.

W - F s cos(θ)

8
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Why is no work done if the force is perpendicular to the direction of motion?

Because cos(90) = 0, so the force has no component in the direction of motion

9
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What does the area under a force-distance graph represent?

The total work done

10
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State the equation for the work done stretching a spring.

W = 0.5 F ΔL