When anything moves, or stops moving, forces are at work! Forces are pushes and pulls that act on objects. Without the force of gravity, for example, we would not be able to stay on the ground!

Machines, from simple tools like levers up to complicated mechanisms like an engine, increase the strength of a force, or change its direction.

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## Forces Facts

• A force is either a push or a pull.
• Forces are measured in Newtons. A force meter, or Newton meter, measures force using a spring.
• Air resistance. or drag, is a force which slows objects down as they move through air.
• Friction is a force that occurs when two surfaces rub together.
• You cannot see a force, but you can see its effect.

## Videos

#### Science Lyric Video – Gravity

Learn all about gravity with this catchy song.

Running time: 3:54

#### Balanced and unbalanced forces

This live lesson from the BBC explains balanced and unbalanced forces.

Running time: 5:02

#### Isaac Newton | Illustrating History

Find out about the life of Isaac Newton and his discovery of gravity.

Running time: 3:00

#### What Is A Force?

This video provides a brief overview of forces.

Running time: 3:37

## Books

##### The Enormous Turnip

Find out what happens when a very, very large turnip doesn’t want to be pulled out of the ground!

##### The Boy Who Harnessed the Wind

The true story of how William Kamkwamba built a windmill and brought electricity to his village.

##### Fantastic Forces and Incredible Machines

Over 30 experiments are included in this engaging book.

##### Forces and Magnets

Find out more about magnets and forces.

##### Forces & Electricity

A comprehensive guide to forces and electricity aimed at Key Stage 2 children.

Are you teaching your children about other topics? Explore our full collection of guides!