The extension of an elastic object, such as a spring, is described by Hooke's law.

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 statement best describes Hooke’s law?

The extension of a spring is directly proportional to the force applied

The extension of a spring is directly proportional to the force applied, provided that the limit of proportionality is not exceeded

The extension of a spring is inversely proportional to the force applied, provided that the limit of proportionality is not exceeded

What is the shape of a Force-Extension graph for a spring if it obeys Hooke’s law?

A straight line

A straight line through the origin

An upward curve

What is the spring constant a measure of?

The extension of a spring

The length of a spring

The stiffness of a spring

What is the unit for the spring constant?

Newton metre (Nm)

Newton per metre squared (N/m^{2})

Newton per metre (N/m)

How is the spring constant found from a Force-extension graph?

It is read from the horizontal (x) axis

It is the gradient of the line

It is the area under the line

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

Elastic potential energy

Gravitational potential energy

Kinetic energy

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 10 cm when a force of 2 N is applied. What is the value of the spring constant?

0.2 N/m

2 N/m

20 N/m