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15.1 Forces and springs

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Question 28
H

An engineer is choosing a spring for a trampoline.

Each spring must:

  • support forces of up to 900 N while the relationship between force and extension stays linear
  • stretch by at least 0.15 m when the force is 900 N, so that it stores enough energy to give a good bounce.

The Table shows information about three springs, X, Y and Z.

Table

SpringSpring constant in N/m\text{N/m}N/mForce at the limit of proportionality in N\text{N}N
X40001200
Y80002000
Z5000800

Evaluate which spring is the most suitable for the trampoline.

Use calculations in your answer.

Use the equation

E=12×k×x2\displaystyle E = \frac{1}{2} \times k \times x^{2}E=21​×k×x2

[6]
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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