Subject: General Science
Book: NCERT Science Class 9
Gravitation is the force of attraction between two objects with mass.
- **Newton’s Universal Law of Gravitation**:
- F = G(m₁m₂)/r²
- **Acceleration Due to Gravity (g)**:
- g = 9.8 m/s² on Earth.
- **Free Fall**:
- Objects falling under gravity without air resistance.
- **Buoyancy**:
- Upward force exerted by a fluid on an object.
**Possible Exam Questions:**
1. State Newton’s law of universal gravitation.
2. Explain why astronauts experience weightlessness in space.
3. How does gravity vary on different planets?
4. Why do objects float in water? Explain buoyancy.
5. Solve numerical problems on gravitational force.
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