A force stretches a spring. Under which condition is the work done on the spring equal to the elastic potential energy stored in the spring?
when the spring is not inelastically deformed
when the spring constant is less than 1 N/m1\ \text{N/m}1 N/m
when the spring returns to its original length slowly
when the extension of the spring is greater than 1 m
40 exam-style questions on AQA GCSE Physics 5.3 Forces and elasticity, covering 5.3 Forces and elasticity. Each one has a worked solution and a mark scheme showing where the marks go.