Work, Energy, and Power Definition, Types, Examples & Uses

Work, Energy, and Power

Subject: General Science

Book: NCERT Science Class 11

Work, energy, and power define how forces interact with motion.
- **Work Done**:
- W = F × d × cosθ (Force × displacement × angle).
- **Types of Energy**:
- Kinetic Energy (KE = ½mv²).
- Potential Energy (PE = mgh).
- **Law of Conservation of Energy**:
- Energy cannot be created or destroyed.
- **Power**:
- P = Work/Time (Rate of doing work).

**Possible Exam Questions:**
1. Define work and derive its formula.
2. What is kinetic energy? Derive its equation.
3. How does the law of conservation of energy apply in nature?
4. What is the SI unit of power? Give examples.
5. Explain why power is a scalar quantity.