Topic Details (Notes format)

Work and Energy

Subject: General Science

Book: NCERT Science Class 9

Work is done when a force is applied to move an object.
- **Work Formula**:
- W = F × d × cosθ
- **Types of Work**:
- Positive work (Force in direction of motion).
- Negative work (Force opposite to motion).
- **Energy**:
- Kinetic Energy: Energy due to motion (KE = ½mv²).
- Potential Energy: Energy stored due to position (PE = mgh).
- **Law of Conservation of Energy**:
- Energy cannot be created or destroyed, only transformed.

**Possible Exam Questions:**
1. What is the difference between kinetic and potential energy?
2. Explain the law of conservation of energy with an example.
3. How is work done calculated? Provide numerical examples.
4. Why is no work done when a person pushes a wall?
5. Derive the formula for kinetic energy.

Practice Questions

Which type of bond is present in sodium chloride?

View Question

What is the primary function of white blood cells?

View Question

What is the SI unit of power?

View Question

Which gas is used in the process of welding?

View Question

Which process converts glucose into energy in the human body?

View Question

What type of macromolecule is an enzyme?

View Question

Which organ is responsible for filtering blood in the human body?

View Question

Which disease is caused by a virus?

View Question

What is the function of platelets in the human body?

View Question

Which element has the highest electrical conductivity?

View Question