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Gravitation

NIOS · Class 12 · Physics

Step-by-step guide to study Gravitation in NIOS Class 12 Physics. Topics to cover, practice strategy, and time allocation.

45 questions35 flashcards5 concepts

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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.

2
Day 3

Practice Problems

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

3
Day 4

Revise & Test

Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.

4
Day 7

Spaced Revision

Revisit Gravitation after a week. Use flashcards for quick recall. Solve previous year questions from 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 Correct vs Incorrect Thinking: Key Gravitation Concepts, Gravitation — Complete Chapter Mind Map, Gravitation — Complete Concept Map. These are the concepts NIOS Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Gravitation — NIOS Class 12 Physics?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and 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.

More resources for Gravitation

All 30 chapters — NIOS Class 12 Physics Study Plan

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