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Study Plan

Gravitation — Study Plan

NIOS · Class 12 · Physics

A step-by-step study plan for Gravitation, NIOS Class 12 Physics: what to learn first, what to practise and when to revise.

45 questions35 flashcards17 formulas & key relations5 concepts

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A diagram showing the Earth as a sphere and multiple objects at different points on its surface, all experiencing acceleration due to gravity (g) directed towards the Earth's center. Illustrates the c
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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas and key ideas. Focus on: Newton's Universal Law of Gravitation, Acceleration Due to Gravity (g), Variation of g with Height, Depth, and Latitude.

2
Day 3

Practise

Solve the textbook exercises and extra practice questions. There are 45 questions available for this chapter.

3
Day 4

Revise & Test

Revise key points without looking at your notes. Take a practice quiz and mark weak areas for another pass.

4
Day 7

Spaced Revision

Come back to Gravitation after a week. Use flashcards for quick recall and try past exam questions on this chapter.

What to Focus On

  • F = G m₁m₂/r² — the fundamental equation of gravitation
  • G = 6.67 × 10⁻¹¹ N m² kg⁻² is the Universal Gravitational Constant
  • Gravitational force is always attractive and acts along the line joining the two masses
  • g = GM/R² — acceleration due to gravity at Earth's surface
  • Value of g at Earth's surface ≈ 9.8 m s⁻²
  • g is independent of the mass of the falling body — all objects fall with the same acceleration in vacuum
  • g decreases with altitude: g_h = g/(1 + h/R)² ≈ g(1 − 2h/R) for small h
  • g decreases with depth: g_d = g(1 − d/R); g = 0 at Earth's center
  • g is maximum at poles and minimum at equator due to Earth's shape and rotation

Common Mistakes to Avoid

Heavier objects fall faster than lighter objects under gravity

There is no gravity in space / astronauts in the International Space Station are weightless because there is no gravity there

Mass and weight are the same thing — they can be used interchangeably

Memory Tips

Newton's Universal Law of Gravitation — F = GMm/r²

G = 6.67 × 10⁻¹¹ Nm²kg⁻² is a universal constant

Acceleration due to gravity g = GM/R² at Earth's surface

g is independent of mass of the falling body

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Frequently Asked Questions

What are the important topics in Gravitation for NIOS Class 12 Physics?
Key topics in Gravitation include Newton's Universal Law of Gravitation, Acceleration Due to Gravity (g), Variation of g with Height, Depth, and Latitude, Weight, Mass, Gravitational Potential and Potential Energy. Study these first, then practise questions on each for the NIOS Class 12 board exam.
How should I revise Gravitation for the NIOS Class 12 board exam?
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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