Forces and Magnets Spring 2023 Y3

All forces are a push or pull. Impact forces are:

• When gravity pulls objects towards the Earth

• when two objects collide

• When an elastic material is stretched or squashed

• When two surfaces are already in contact

Look at the diagram of magnets. If the two poles of a magnet are the same, they will:

• attract

• not touch one another

• touch one another

• repel

Frictional forces occur when:

• when an object is stretched or squashed

• two objects are already in contact

• when a boat floats on the water

• when two surfaces collide

Magnets have two poles. These are called:

• North and South

• East and West

• North and North

• South and South

A very famous scientist discovered gravity when an apple fell on his head. What was his name?

• Albert Einstein

• Louis Pasteur

• Charles Darwin

• Sir Isaac Newton

The biggest magnet is the strongest:

• Always

• Never

• Sometimes

Which force is provided by rockets to work against gravity?

• Friction

• Gravity

• Thrust

• Buoyancy

Gravity makes things float away from the Earth

• True

• False

Centrifugal force pushes people's bodies out on fairground rides.

• False

• True

When a material is stretched or squashed it is called a

• strain force

• impact force

• frictional force