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 are scalar quantities?
- Why ball rolling on rough surface stops earlier?
- What is momentum of an isolated system?
- How can express liters?
- What is zero error?
- What is net force?