Chapter 5 of 14
Revision Notes
Gravitation — Revision Notes
Maharashtra Board · Class 11 · Physics
Gravitation revision notes for Maharashtra Board Class 11 Physics: 4 topics in quick points. Part of the Maharashtra Board Class 11 Physics syllabus.
45 questions24 flashcards10 formulas & key relations5 concepts
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Key Topics to Revise
1
Kepler's Laws of Planetary Motion
- Law of Orbits: All planets move in elliptical orbits with the Sun at one focus
- Law of Areas: The line joining planet and Sun sweeps equal areas in equal time intervals
- Law of Periods: Square of time period is proportional to cube of semi-major axis (T² ∝ r³)
2
Newton's Universal Law of Gravitation
- Every particle attracts every other particle with force proportional to product of masses and inversely proportional to square of distance
- Gravitational force is always attractive and acts along line joining centers
- Force follows Newton's third law - equal and opposite force pairs
3
Acceleration Due to Gravity and Its Variations
- Acceleration due to gravity g = GM/R² at Earth's surface
- Value of g decreases with altitude: gₕ = g(1 - 2h/R) for h << R
- Value of g decreases with depth: gₐ = g(1 - d/R)
4
Gravitational Potential Energy and Escape Velocity
- Gravitational potential energy U = -GMm/r (taking U = 0 at r = ∞)
- Near Earth's surface: ΔU = mgh for small heights h << R
- Gravitational potential V = -GM/r (potential energy per unit mass)
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Full NotesKey Concepts
Three fundamental laws describing planetary motionEvery particle attracts every other particleg = GM/r² gives accelerationU =vₑ = √(2GM/R) is minimum velocity
Frequently Asked Questions
What are the important topics in Gravitation for Maharashtra Board Class 11 Physics?
Key topics in Gravitation include Kepler's Laws of Planetary Motion, Newton's Universal Law of Gravitation, Acceleration Due to Gravity and Its Variations, Gravitational Potential Energy and Escape Velocity. Study these first, then practise questions on each for Class 11 exams.
How should I revise Gravitation for Class 11 exams?
Learn the core ideas first, then work through the 45 practice questions on Gravitation. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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