A graph of force against extension for a spring is a straight line through the origin. What does this show?
The spring has been inelastically deformed.
The extension of the spring is zero.
The extension is directly proportional to the force.
The spring constant increases as the force increases.
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.