Subject: General Science
Book: NCERT Science Class 8
Friction is the force that opposes motion between two surfaces.
- **Types of Friction**:
- Static, sliding, rolling, fluid friction.
- **Effects**:
- Causes wear and tear but helps in walking.
- **Ways to Reduce Friction**:
- Lubrication, ball bearings.
**Possible Exam Questions:**
1. What is friction? How is it useful and harmful?
2. Explain the methods of reducing friction.
3. Why does an oiled machine work more smoothly?
4. Discuss applications of friction in sports.
5. Why do athletes wear special shoes?
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