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3 Conservation of energy

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Question 67
H

In a car, the engine transfers energy to the gearbox, and the gearbox transfers energy to the wheels.

The efficiency of the engine is 0.30. The efficiency of the gearbox is 0.90.

During a short journey, the fuel supplies 500 kJ of energy to the engine.

a.

Calculate the useful energy transferred from the engine to the gearbox.

[2]
b.

Calculate the overall efficiency of the car, from the energy supplied by the fuel to the energy transferred to the wheels.

[3]
c.

Explain why the overall efficiency is lower than the efficiency of the engine or the gearbox on its own.

[2]
d.

Explain one way that the efficiency of the gearbox could be increased.

[2]
Markscheme

3 Conservation of energy Questions

  1. GCSE
  2. /Physics
  3. /3 Conservation of energy

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