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15.1 Forces and springs

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Question 29

The return spring in a cable reel has a linear force-extension relationship. At one position, the force exerted on the spring is 8.0 N. The cable is pulled farther until the elastic potential energy stored in the spring is nine times as large. Use E=12kx2\displaystyle E=\frac{1}{2}kx^2E=21​kx2 and F=kxF=kxF=kx. What force is now exerted on the spring?

[1]
A

24 N24\ \mathrm{N}24 N

B

8.0 N8.0\ \mathrm{N}8.0 N

C

2.7 N2.7\ \mathrm{N}2.7 N

D

72 N72\ \mathrm{N}72 N

Markscheme

15.1 Forces and springs Questions

  1. GCSE
  2. /Physics
  3. /15.1 Forces and springs

102 exam-style questions on Edexcel GCSE Physics 15.1 Forces and springs, covering 15.1.1 Elastic and inelastic distortion, 15.1.2 The spring constant, 15.1.3 Work done in stretching a spring, and 15.1.4 Linear and non-linear force–extension. Each one has a worked solution and a mark scheme showing where the marks go.

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