Year 7 friction

Which picture shows a friction force?

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Which factor can affect the size of the friction force acting when an object slides over a surface?

• The colour of the surface.

• How transparent the surface is.

• How rough the surface is.

Identify the false statement.

• Friction forces can slow down an object.

• Friction forces can prevent movement.

• Friction forces only act when there is movement.

How can friction be reduced?

• reduce the force acting between the 2 surfaces

• reduce the roughness of the 2 surfaces coming in contact

• use wax, grease or oil

• all of them are ways of reducing friction

How does friction affect speed?

• more friction decreases speed

• more friction increases speed

• less friction decreases speed

• less friction doesn't affect speed