Types of Friction
The friction is of the following types :
- Static friction: It is the friction experienced by two bodies in contact while at rest.
- Dynamic (or kinetic) friction: It is the friction experienced by two bodies in contact while in motion. It is less than the static friction.
- Sliding friction: It is due to the sliding of two bodies on each other.
- Rolling friction: It is due to the rolling of two bodies on each other.
- Pivot friction: It is the friction experienced by two bodies due to the motion of rotation of one body in the other, as in the case of a footstep bearing.
- Dry (or solid) friction: It is due to two dry and unlubricated surfaces in contact.
- Boundary (or skin) friction: It is the friction experienced by two bodies separated by a very thin layer of a lubricant.
- Fluid (or film) friction: It is the friction experienced by two bodies in contact when separated by a thick film of a lubricant.
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