Two springs P and Q store the same elastic energy. Both obey Hooke's law. The spring constant of P is four times that of Q. Which gives the extension and force for P compared with Q?
Half the extension and twice the force.
Twice the extension and half the force.
One-quarter of the extension and the same force.
Half the extension and four times the force.
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.