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.
Learn also:
- Why does small bullet have strong impact?
- What is meter rule?
- What is translatory motion?
- What is difference between linear and translatory motion?
- Why is rolling friction extremely small than sliding friction?
- What is a momentum?


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