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Question
Give the different types of friction and explain each with an example.
Solution
Friction can be classified into two basic types:
- Static friction:
The friction experienced by the bodies, which are at rest is called static friction. (E.g: All the objects rigidly placed to be at rest on the Earth, a knot in a thread. - Kinetic friction:
Friction existing during the motion of bodies is called kinetic friction.
Further, kinetic friction can be classified into two:
- Sliding friction:
When a body slides over the surface of another body, the friction acting between the surfaces in contact is called sliding friction. - Rolling friction: When a body rolls over another surface, the friction acting between the surfaces in contact is called rolling friction. Rolling friction is less than sliding friction. That is why wheels are provided in vehicles, trolleys, suitcases, etc.
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