Difference between revisions of "Friction"
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| − | 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> | + | 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: |
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| + | ;[[static friction]] | ||
| + | :the force that is needed for motion to start if the surfaces are initially at rest with respect to each other. | ||
| + | ;[[dynamic 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.<ref>Marcelo Alonso and Edward J. Finn, ''Fundamental University Physics'', Addison-Wesley.</ref> | ||
==References== | ==References== | ||
Revision as of 20:15, March 12, 2007
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.
- dynamic 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]