In a heavy-duty industrial safety valve, a high-tensile steel spring keeps a sealing plug closed. When excess pressure forces the plug open, a solid steel limiting collar restricts the maximum displacement of the spring.
Explain how this limiting collar prevents the safety valve's spring from becoming permanently deformed.
23 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.