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3 Conservation of energy

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Question 49
F

The Table shows the energy transfers in a car engine each second.

Table

Energy transferEnergy in kJ\text{kJ}kJ
energy supplied from the chemical store of the fuel200
energy transferred usefully to the kinetic store of the car50
energy transferred to the thermal store of the engine and exhaust gases120
energy transferred by sound4
energy transferred by heating due to friction between moving partsXXX
a.

Calculate the value of XXX.

[2]
b.

Calculate the efficiency of the engine.

[2]
c.

The moving parts of the engine rub against each other.

Explain why this mechanical process is described as wasteful.

[2]
d.

Suggest how the engine designer could reduce the value of XXX.

[1]
Markscheme

3 Conservation of energy Questions

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

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