# How is friction created BBC?

## How is friction created BBC?

A force is needed to start an object moving and to stop it once it is moving. Friction is a force generated when surfaces move across each other.

### How does friction created?

Scientists are not completely sure what causes friction; however it is thought to be caused by the interactions between the tiny bumps on surfaces as they rub against each other. The bumps on each surface bend and exert a force on each other making it hard for the surfaces to slip over each other.

#### What causes friction BBC Bitesize?

The amount of friction depends on the materials from which the two surfaces are made. The rougher the surface, the more friction is produced. Friction also produces heat. If you rub your hands together quickly, you will feel them get warmer.

What can stop friction?

Methods of reducing friction

• Make surfaces smooth by grinding.
• Lubrication.
• Streamlined body.
• Reduce pressure or weight on the object.
• Reduce contact between surfaces by electrostatic magnetic levitation etc.
• Use rolling friction instead of sliding friction.
• Use fluid friction instead of the dry friction.

Is friction and resistance the same?

Friction is a force, the resistance of motion when one object rubs against another. One kind of friction or resistance is air resistance. Air resistance occurs between the surface of a falling object and the air that surrounds it and it also works to slow the rate at which the object falls.

## How is friction created in a bobsled example?

– KS2 Science – BBC Bitesize How is friction created? An explanation of friction using a bobsled as an example. A force is needed to start an object moving and to stop it once it is moving. A force can make an object speed up or slow down. Friction is a force generated when surfaces move across each other.

### How is friction used in the real world?

Note: There is no narration in this clip. Can be used when learning about forces by allowing pupils to observe the effects of friction on movement. It could be used prior to investigations into the properties of some materials which, when used as a surface, can cause objects to speed up or slow down.

#### What can you do with a p.e.lesson on friction?

An A P.E. lesson could be devised as a follow up which can include bowling activities and push and pull exercises. As an extension activity, pupils could devise their own friction investigation and design their own cars to test.

Why is friction needed to make an object move?

A force is needed to start an object moving and to stop it once it is moving. A force can make an object speed up or slow down. Friction is a force generated when surfaces move across each other.