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.
- How does force of friction help in walking?
- How physics can be applied?
- Why does small bullet have strong impact?
- Why ball rolling on rough surface stops earlier?
- What is translatory motion?
- What is difference between circular and rotatory motion?