Gravitation – Final Revision & Methods
One-Page Thinking System for Boards • JEE Main • JEE Advanced
This page is designed for last-stage preparation. If you revise only this before exam, you will:
- Recall correct formulas instantly
- Avoid examiner traps
- Choose the fastest solving method
- Stay calm inside the exam hall
METHOD 1: Identify the PROBLEM TYPE (5 seconds)
- Falling body → Force + acceleration
- Orbit → Centripetal + energy
- Height / depth → g-variation
- Escape → Total energy = 0
Rule: Wrong method = long solution = wrong answer.
METHOD 2: Formula FIRST, Numbers LATER
Never substitute values immediately.
- Write symbolic equation
- Simplify ratio / power
- Then substitute
This avoids silly mistakes
METHOD 3: 5 MOST POWERFUL FORMULAS
- v = √(GM/r)
- E = −GMm / (2r)
- ve = √(2GM/r)
- T² ∝ r³
- g ∝ 1/r²
90% problems solved here
METHOD 4: ENERGY SIGN CHECK
- E < 0 → Bound orbit
- E = 0 → Just escape
- E > 0 → Hyperbolic path
Shortcut: Don’t solve fully — check sign.
METHOD 5: DIRECTION OF VELOCITY CHANGE
- Tangential push → energy change
- Radial push → orbit shape change
- No push → same orbit
IIT favourite logic test
METHOD 6: g-VARIATION MEMORY MAP
- Inside Earth → g ∝ r
- Surface → maximum
- Outside → g ∝ 1/r²
Graph questions solved instantly
METHOD 7: FIELD vs POTENTIAL RULE
- Field → vector (can cancel)
- Potential → scalar (adds)
- Field = − gradient of potential
Classic examiner trap
METHOD 8: LIMITING CASE CHECK
Before final answer, ask:
- What if r → ∞?
- What if h = 0?
- What if speed = orbital?
1 check = 4 marks saved
EXAM-HALL STRATEGY (VERY IMPORTANT)
- Do gravitation first (easy marks)
- Skip long numericals initially
- Use elimination for MCQs
- Never panic on length
- Recheck units & powers
Gravitation is a scoring chapter
FINAL REVISION MANTRA
Think → Choose → Solve → Check
Not
Read → Panic → Calculate
Gravitation – Revision Completed Successfully ✅
📚 IIT JEE PHYSICS – COMPLETE MASTER LIBRARY
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🌍 GRAVITATION – IIT JEE EXAM MASTERY (FULL SERIES)
Concept → Board → IIT → Tough → Mastery
- Gravitation – Part 1
- Gravitation – Part 2
- Gravitation – Part 3
- Gravitation – Part 4
- Gravitation – Part 5
- Gravitation – Part 6
- Gravitation – Part 7
- Gravitation – Part 8
- Gravitation – Part 9
- Gravitation – Part 10
- Gravitation – Part 11
- Gravitation – Part 12
- Gravitation – Part 13
- Gravitation – Part 14
- Gravitation – Part 15
- Gravitation – Part 16
- Gravitation – Part 17
- Gravitation – Part 18
- Gravitation – Part 19
- Gravitation – Part 20
- Gravitation – Part 21
- Gravitation – Part 22
- Gravitation – Part 23
- Gravitation – Part 24
- Gravitation – Part 25
- Gravitation – Part 26
- Gravitation – Part 27
- Gravitation – Part 28
- Gravitation – Part 29
- Gravitation – Part 30
- Gravitation – Part 31
- Gravitation – Part 32
- Gravitation – Part 34
- Gravitation – Part 35
- Gravitation – Part 36
- Gravitation – Part 37
- Gravitation – Part 38
- Gravitation – Part 39
- Gravitation – Part 40
- Gravitation – Part 41
- Gravitation – Part 42
📘 OTHER PHYSICS LIBRARIES
- Momentum & Collisions – Complete Library
- Centre of Mass & System of Particles – Complete Library
- Work, Energy & Power – Complete Library
🧠 THINKING & FOUNDATION
🌐 MASTER HUBS
📲 STUDENT COMMUNITY
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