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8.1 Energy transfers and work

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Question 34

A spring drives a rotor inside a sealed, insulated casing. The spring, rotor and casing form a closed system. At the first measurement, the elastic potential energy store of the spring is 15 J and the kinetic energy store of the rotor is 3.0 J. At the second measurement, the kinetic energy store of the rotor is 11 J. No other energy stores change between the two measurements.

What is the elastic potential energy store of the spring at the second measurement?

[1]
A

7.0 J7.0\ \mathrm{J}7.0 J

B

4.0 J4.0\ \mathrm{J}4.0 J

C

8.0 J8.0\ \mathrm{J}8.0 J

D

18 J18\ \mathrm{J}18 J

Markscheme

8.1 Energy transfers and work Questions

  1. GCSE
  2. /Physics
  3. /8.1 Energy transfers and work

115 exam-style questions on Edexcel GCSE Physics 8.1 Energy transfers and work, covering 8.1.1 Energy stores and transfer diagrams, 8.1.2 Ways of changing a system's energy, and 8.1.3 Work done by forces. Each one has a worked solution and a mark scheme showing where the marks go.

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