A force of 12 N stretches a spring by 40 mm.
The force-extension relationship is linear.
Use the equation: energy transferred in stretching=12×spring constant×(extension)2\text{energy transferred in stretching} = \dfrac{1}{2} \times \text{spring constant} \times (\text{extension})^2energy transferred in stretching=21×spring constant×(extension)2
How much energy is stored in the spring?
0.48 J0.48\ \text{J}0.48 J
0.24 J0.24\ \text{J}0.24 J
2.4 J2.4\ \text{J}2.4 J
240 J240\ \text{J}240 J
46 exam-style questions on OCR GCSE Physics 2.3 Forces in action, covering 2.3.1 Stretching, bending and compressing, 2.3.2 Elastic and plastic deformation, 2.3.3 Force and extension of a spring, 2.3.4 Linear and non-linear force-extension behaviour, 2.3.5 The spring constant, 2.3.6 Work done in stretching, 2.3.7 Gravitational fields, 2.3.8 Weight and gravitational field strength, 2.3.9 Acceleration in free fall, 2.3.10 Relating force, mass and gravitational field strength, 2.3.11 Forces causing rotation, 2.3.12 The moment of a force, 2.3.13 Levers and gears, 2.3.14 Pressure in fluids, and 2.3.15 Pressure, force and contact area. Each one has a worked solution and a mark scheme showing where the marks go.