Try this as often as you like.

- Robert Hooke (1635-1703) made a number of discoveries including the effect of force on elastic bodies now known as Hooke’s law.

Which one of the following statements is known as Hooke's Law?- The extension of a stretched spring is proportional to the force causing it.
- Every action has an equal and opposite reaction.
- When a body is in equilibrium, the sum of the clockwise moments is equal to the sum of the anticlockwise moments.
- Work = force x distance moved in the direction of the force.

- A group of students investigated the relationship between the extension of a spring and the force causing it.

They plotted a graph of extension against force as shown.

What extension is caused by a force of 3 newtons?- 6 cm
- 1.5 cm
- 3 cm
- 9 cm

- A student was given a box of identical springs and asked to analyse them so that they could be used as newtonmeters.

The student performed an experiment, using the apparatus shown in the diagram, on one of the springs.

In the experiment the student measured the increase in length of the spring caused by a number of weights. The spring was tested to destruction (that is weights were added until the spring was damaged).

A graph of extension versus force (weight) was plotted as shown.

What weight would produce an extension of 5 cm?- 1.0 newton
- 2 newtons
- 1.25 newtons
- 10 newtons

- A student was given a box of identical springs and asked to analyse them so that they could be used as newton meters.

The student performed an experiment, using the apparatus shown in the diagram, on one of the springs.

In the experiment the student measured the increase in length of the spring caused by a number of weights. The spring was tested to destruction (that is weights were added until the spring was damaged).

A graph of extension versus force was plotted as shown.

Study this graph carefully.

The spring obeys Hooke’s law for the earlier extensions and then when the spring becomes damaged it does not appear to do so.

Estimate, from your graph, the weight after the addition of which the law seems no longer to apply.- 1.6 newton
- 1.5 newtons
- 2.0 newtons
- 8 newtons

- A student investigated the relationship between force on a spring and the extension it caused on the spring. She plotted a graph from her results.

She placed too many weights on the spring and caused the spring to go beyond its elastic limit, where it was permanently destroyed.

Where on the graph is the elastic limit?- C
- A
- B
- D

- A pupil used the apparatus shown in the diagram to investigate the relationship between the force applied and the extension produced in the spring by that force.

Pointer, P, was used to read the scale.

Weights were added to the pan to apply forces to the spring.

The graph was recorded from the results.

A stone produced an extension of 14 cm with this spring.- 8 N
- 12 N
- 16 N
- 7 N