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Gravitation

Rajasthan Board · Class 9 · Science

Step-by-step guide to study Gravitation in Rajasthan Board Class 9 Science. Topics to cover, practice strategy, and time allocation.

30 questions24 flashcards5 concepts

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An illustration showing Newton under an apple tree, with an apple falling towards the Earth, and simultaneously, the Moon orbiting the Earth, to visually connect the two phenomena under the same gravi
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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 30 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

  • Gravitation is the universal force of attraction between any two objects with mass.
  • Newton proposed that the same gravitational force causes apples to fall and the moon to orbit Earth.
  • Universal Law: F = GMm/d², where G = 6.674 × 10⁻¹¹ N m² kg⁻².

  • Free fall: motion of an object under Earth's gravity alone, with no other forces acting.
  • Acceleration due to gravity (g) ≈ 9.8 m/s², often approximated as 10 m/s².
  • Formula: g = GMₑ/Rₑ² (derived by combining Newton's Second Law and Universal Gravitation Law).

  • Mass is the measure of inertia; it is constant everywhere and measured in kilograms (kg).
  • Weight is the gravitational force on an object: W = mg; it is measured in Newtons (N).
  • Weight is a vector (downward direction); mass is a scalar.

Common Mistakes to Avoid

Weight and mass are the same thing — they can be used interchangeably.

Heavier objects fall faster than lighter objects.

There is no gravity in space — that is why astronauts float.

Memory Tips

Universal Law of Gravitation — every object attracts every other object

Gravitational force is directly proportional to product of masses (F ∝ m₁ × m₂)

Gravitational force is inversely proportional to square of distance (F ∝ 1/d²)

Value of G = 6.674 × 10⁻¹¹ N m² kg⁻²

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Frequently Asked Questions

What are the important topics in Gravitation for Rajasthan Board Class 9 Science?
Key topics in Gravitation include Chapter 9 Gravitation — Complete Concept Map, Gravitation Chapter — Complete Concept Map, Chapter 9 Gravitation — Concept Overview. These are the concepts Rajasthan Board Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Gravitation — Rajasthan Board Class 9 Science?
Understand the core concepts first, then work through the 30 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 12 chapters — Rajasthan Board Class 9 Science Study Plan

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