Gravitation — Revision Notes
MHT-CET · Physics
Quick revision notes for Gravitation — key concepts, formulas, and definitions for MHT-CET Physics preparation.
Revision Notes — Gravitation
Key concepts, formulas, and definitions from Gravitation for MHT-CET Physics preparation.
Key Topics to Revise
Kepler's Laws of Planetary Motion
- First Law (Law of Orbits): Every planet revolves around the Sun in an elliptical orbit with the Sun at one focus
- Second Law (Law of Areas): The line joining a planet to the Sun sweeps equal areas in equal time intervals
- Third Law (Law of Periods): T² ∝ R³, where T is the orbital period and R is the semi-major axis
Newton's Universal Law of Gravitation
- Every particle in the universe attracts every other particle with a force proportional to product of masses and inversely proportional to square of distance
- Gravitational force is always attractive and acts along the line joining the centers
- The force obeys Newton's third law - action and reaction pairs
Acceleration due to Gravity and its Variations
- At Earth's surface: g = GM_E/R_E² = 9.8 m/s²
- g varies with height: g(h) = g(1 - 2h/R_E) for h << R_E
- g varies with depth: g(d) = g(1 - d/R_E)
Gravitational Potential Energy
- Gravitational PE is the energy stored due to position in a gravitational field
- Reference point is taken at infinity where U = 0
- PE is always negative for bound systems
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What topics are covered in Gravitation for MHT-CET?
Gravitation is an important chapter in MHT-CET Physics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Kepler's Laws of Planetary Motion, Newton's Universal Law of Gravitation, Acceleration due to Gravity and its Variations, Gravitational Potential Energy.
How important is Gravitation for MHT-CET?
Gravitation is a frequently tested chapter in MHT-CET Physics. Questions from this chapter appear regularly in previous year papers. There are 55 practice questions available for this chapter.
How to prepare Gravitation for MHT-CET?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.