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Physics Friction Theory

Friction is the force that occurs when two different surfaces come into contact and move
past one another. Friction generates heat and sound and in many situations has a very useful
application, e.g. the brakes of a car.

Friction is the force which opposes the motion of one object past another.
Friction can be reduced when:

• Air is used to act as a cushion, e.g. a hovercraft
• Aerodynamic streamlined shapes, e.g. a plane.

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Without friction there would be chaos as nothing would stay in place.