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:
- What is difference between mass and weight?
- What is acceleration?
- Why is it advised to wear seatbelts?
- What is gravitational acceleration?
- What is difference between distance and displacement?
- How does force of friction help in walking?