Difference between revisions of "Friction"
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| − | + | '''Friction''' is a [[force]] resulting from the contact of two surfaces. This force opposes motion.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>. For solid bodies, one can distinguish two types of friction: | |
| − | ;[[ | + | ;[[Static friction]] |
:the force that is needed for motion to start if the surfaces are initially at rest with respect to each other. | :the force that is needed for motion to start if the surfaces are initially at rest with respect to each other. | ||
;[[Kinetic friction]] | ;[[Kinetic friction]] | ||
Revision as of 22:11, August 30, 2008
Friction is a force resulting from the contact of two surfaces. This force opposes motion.[1]. For solid bodies, one can distinguish two types of friction:
- Static friction
- the force that is needed for motion to start if the surfaces are initially at rest with respect to each other.
- Kinetic friction
- the force that is caused by friction once the surfaces are moving with respect to each other.
For solid surfaces, both types of friction depend (to a good approximation) only on the normal force. In particular, the dynamic friction does not depend on the velocity.[2]