A tension spring in an automatic greenhouse vent has an original length of 5.0 cm. During a test, a force of 150 N increases the length of the spring to 8.0 cm. When the vent is fully open, the length of the spring is 9.0 cm.
The force-extension relationship remains linear over this range.
Use E=12kx2\displaystyle E=\frac{1}{2}kx^2E=21kx2.
Calculate the work done in stretching the spring from its original length until the vent is fully open.
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.