A student stretches a spring and then removes the forces. Which observation shows that the distortion was elastic?
The spring returns to its original length.
The spring remains longer than its original length.
The spring becomes shorter than its original length.
The spring remains at its stretched length.
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.