Difference between revisions of "Friction"
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;[[static 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]] |
:the force that is caused by friction once the surfaces are moving with respect to each other. | :the force that is caused by friction once the surfaces are moving with respect to each other. | ||
Revision as of 08:36, May 5, 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.
- 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]