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Forces And Elasticity (GCSE Physics)

The following is a GCSE Physics test covering 'Forces And Elasticity' from the broader topic Forces. The test is geared towards the AQA exam board style syllabus.
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Stress and strain are defined as stress = force/area and strain = extension/original length. What are their SI units?
What is the expression for the moment (torque) M produced by a force F acting at a perpendicular distance d from a pivot?
Which sign is used in Hooke’s law F = -k x to indicate the spring force’s direction relative to displacement?
Which formula gives the elastic potential energy stored in a stretched spring with spring constant k and extension x?
When gear A turns clockwise and meshes directly with gear B, what is the direction of rotation of gear B?
A spring stores 4.0 J of elastic potential energy when stretched by 0.080 m. What is the spring constant k (N/m)?
A spring with spring constant 200 N/m is stretched 0.10 m. How much elastic potential energy is stored in the spring?
If a body is in equilibrium under several forces, the resultant (net) force on it is:
A wire obeying Hooke’s law is used as a spring. If the extension doubles under a larger load, the elastic potential energy stored (1/2 k x^2) will:
A metal spring of k = 800 N/m is compressed by 0.05 m. What is the elastic potential energy stored?
If two springs in series are identical with constant k, the effective spring constant is: