Forces And Elasticity (GCSE Physics)

A spring obeying Hooke’s law when stretched means the extension of the spring is directly proportional to the applied force.

A long wire is stretched by 1% of its original length. What is the strain?

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 force of 2.0 N acts at a perpendicular distance of 7.5 cm from a pivot. What is the moment about the pivot?

Which graph of force (vertical axis) against extension (horizontal axis) shows a spring obeying Hooke’s law?

A student measures force–extension for a spring and obtains a straight line through origin up to a point, and beyond that the graph curves. The point where linearity ends is called the:

A beam is in equilibrium under several turning moments. This means the sum of clockwise moments equals the sum of anticlockwise moments about any pivot.

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 wire stretched from length L to L+?L has strain defined as:

Two identical bungee cords each have spring constant 735 N/m and each is stretched by 8.0 m when a pod is released. The pod plus rider has mass 240 kg. Assuming no energy losses, what is the maximum rise (height gained) the pod achieves (in m)?