Friction

From DmWiki

In physics, friction is the force that resists movement when two surfaces are pressed against each other. Without friction, we would never be able to stop moving (or start moving for that matter), but would simply slide everywhere.

In game development friction is used many ways for added realism.

Gamasutra: Contact Physics (http://www.gamasutra.com/resource_guide/20030121/kennedy_03.shtml)

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