Forces are responsible for changing the motion of objects. If more than one force is present, the shape of an object can also be changed.

How might the shape of an object change if forces act away from each other in a straight line?

It might extend

It might compress

It might bend

How might the shape of an object change if forces act towards each other in a straight line?

Which word describes an object that will return to its original shape when forces are removed?

Plastic

Linear

Elastic

At what point does the behaviour of a spring tend to become non-linear?

Plastic limit

Elastic limit

Inelastic limit

What is the unit for the spring constant?

Newton-metres (Nm)

Newtons per metre squared (N/m²)

Newtons per metre (N/m)

What is the name for energy stored by a stretched spring?

Elastic potential energy

Gravitational potential energy

Kinetic energy

Which equation gives the energy stored by a stretched spring?

Energy transferred in stretching = spring constant × extension

Energy transferred in stretching = 0.5 × (spring constant)^{2} × extension

Energy transferred in stretching = 0.5 × spring constant × (extension)^{2}

A spring extends elastically by 10 cm when a force of 20 N is applied to it. What force would be needed to extend the spring by 5 cm?

40 N

10 N

5 N

A spring extends elastically by 0.1 m when a force of 2 N is applied. What is the value of its spring constant?

0.2 N/m

0.05 N/m

20 N/m

How can the work done in stretching a spring be calculated from a force-extension graph?

By calculating the gradient

By calculating the area under the graph

By calculating the y-intercept