Friction is the resistance experienced by an object or surface when moving over one another. It is contact force. We use it as:
- We use friction while walking, friction between our foot and ground helps us in walking. - Friction helps us to write too. Friction acts between pen and paper.
- Wood is cut because of the friction caused by the axe.
- We also use friction while opening the lids of jars, caps of pens , etc.