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1.2 Conservation and dissipation of energy

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Question 30

A test rig is a closed system. A trolley is released from rest while raised above a track. The energy in the system at the start and at a later time is shown below.

TimeGravitational potential storeKinetic storeThermal store
Start120 J0 J0 J
Later35 J70 J?
a.

Calculate the energy in the thermal store at the later time.

[1]
b.

The test is repeated from the same starting conditions, but there is greater friction between the trolley and the track. At the same later position, the energy in the gravitational potential store is again 35 J.

Explain how the greater friction affects the energy in the kinetic store and the energy in the thermal store at this position.

[2]
Markscheme

1.2 Conservation and dissipation of energy Questions

  1. GCSE
  2. /Physics
  3. /1.2 Conservation and dissipation of energy

104 exam-style questions on AQA GCSE Physics 1.2 Conservation and dissipation of energy, covering 1.2.1 Energy transfers in a system and 1.2.2 Efficiency. Each one has a worked solution and a mark scheme showing where the marks go.

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