A manufacturer tests a tension spring used in a cupboard-door closing mechanism. A force of 12 N produces an extension of 0.030 m. The spring remains in its linear region for all the extensions in this test. Use F=kxF=kxF=kx and E=12kx2\displaystyle E=\frac{1}{2}kx^2E=21kx2. What is the elastic potential energy stored when the extension is 0.050 m?
0.30 J0.30\ \mathrm{J}0.30 J
1.0 J1.0\ \mathrm{J}1.0 J
0.18 J0.18\ \mathrm{J}0.18 J
0.50 J0.50\ \mathrm{J}0.50 J
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.