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8 Energy – forces doing work

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Question 80
F

A motor lifts a load. Its bearings are lubricated, reducing friction. The useful work done is unchanged. Which change is expected?

[1]
A

Less energy is dissipated, so less input energy is needed.

B

More energy is dissipated, so more input energy is needed.

C

Less energy is dissipated, so more input energy is needed.

D

More energy is dissipated, so less input energy is needed.

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8 Energy – forces doing work Questions

  1. GCSE
  2. /Physics
  3. /8 Energy – forces doing work

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