The spring in a self-closing gate has a spring constant of 180 N/m and stays within its linear region. As the gate closes, the extension of the spring falls from 0.080 m to 0.040 m.
Use E=12kx2\displaystyle E=\frac{1}{2}kx^2E=21kx2.
What energy is transferred out of the spring's elastic potential energy store as the gate closes?
0.14 J0.14\ \mathrm{J}0.14 J
0.58 J0.58\ \mathrm{J}0.58 J
0.86 J0.86\ \mathrm{J}0.86 J
0.43 J0.43\ \mathrm{J}0.43 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.