4 Forces topic Review

A force can change the . . .

• speed, shape or colour of an object.

• speed or direction of an object.

• speed, direction or shape of an object.

• speed or shape of an object.

Which two of the following are contact forces?

• gravity

• air resistance

• magnetism

• friction

A deformation is a change in (a)   .

• speed

• shape

• direction

When you apply a force to an object, the object can change shape. If tension is applied, the object may be stretched. We say the object has been (a)   .

• compressed

• extended

• twisted

When you apply a force to an object, the object can change shape. If a compression force is applied, the object may be squashed. We say the object has been (a)   .

• compressed

• extended

• twisted

The (a)   of an object is the increase in its length when it is stretched.

• compression

• extension

• magnification

The (a)   of an object is the decrease in its length when it is squashed.

• compression

• extension

• equilibrium

What is the extension of the spring in centimetres?

• 1

• 2

• 3

• 4

What is the compression of the spring in centimetres?

• 4

• 8

• 12

• 0

Which two statements are valid conclusions from the data shown in the graph?

• There is a linear relationship between the force applied and the extension of the spring.

• There is a non-linear relationship between the force applied and the extension of the spring.

• Each force applied causes a different amount of extension.

• The extension is directly proportional to the force applied.