Topic: Dynamics and Equilibrium Subtopic: Friction
Why does force of friction oppose motion?
Answer: Friction exists between the surfaces in contact. No real surface is perfectly smooth. Every surface has small pits and bumps. When two rough surfaces come in contact with each other they forms sort of cold welds. These cold welds resist the surfaces to slide over each other. Hence, generating force of friction.
- What is difference between circular and rotatory motion?
- On what factors force of friction depends?
- What is net force?
- Why vectors cannot be described by only magnitude?
- Why ball rolling on rough surface stops earlier?
- Why is rolling friction extremely small than sliding friction?