Friction

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Friction
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What is friction?
The force that two surfaces exert on each other
when they rub against each other.
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What does friction depend on?

• The type of surface is one factor.
• The amount of force is another.

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Sliding Friction
This is when two solid surfaces slide over each
other.
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Rolling Friction
This occurs when an object rolls over another
surface (wheels).
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Fluid Friction
The friction that occurs when an object moves
through a liquid or a gas.