A student holds a foam strip with one hand at each end. The strip gets shorter while its centre stays in the same place.
Which arrangement of forces acts on the strip?
A single force acts at one end along the strip.
A pair of forces act towards the centre from opposite ends.
A pair of forces act away from the centre at opposite ends.
Two forces act in the same direction along the strip.
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.