Physics (AS & A Level) · May / June 2019 · Paper 21 · Question 3

The variation with extension x of the force F acting on a spring is shown in Fig. 3.1. 0 1.0 2.0 3.0 4.0 5.0 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 x / m F / N Fig. 3.1 The spring of unstretched length 0.40 m has one end attached to a fixed point, as shown in Fig. 3.2. 0.40 m unstretched spring 0.72 m block moving downwards block, weight 2.5 N Fig. 3.2 Fig. 3.3 A block of weight 2.5 N is then attached to the spring. The block is then released and begins to move downwards. At one instant, as the block is continuing to move downwards, the spring has a length of 0.72 m, as shown in Fig. 3.3. Assume that the air resistance and the mass of the spring are both negligible.

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