Gravitation — Study Plan
Madhya Pradesh Board · Class 9 · Science
A step-by-step study plan for Gravitation, Madhya Pradesh Board Class 9 Science: what to learn first, what to practise and when to revise.
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Study Plan
Learn the Theory
Read the textbook chapter carefully. Note down definitions, formulas and key ideas. Focus on: Universal Law of Gravitation, Free Fall and Acceleration due to Gravity, Mass and Weight.
Practise
Solve the textbook exercises and extra practice questions. There are 30 questions available for this chapter.
Revise & Test
Revise key points without looking at your notes. Take a practice quiz and mark weak areas for another pass.
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
- 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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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Gravitation
Practice Quiz
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Important Questions
Exam-style questions with answers
Revision Notes
Key points for last-minute revision
Formula Sheet
The chapter's formulas in one place
Chapter Summary
Understand the chapter at a glance
Concept Maps
See how topics connect
Flashcards
Quick-fire cards for active recall
Syllabus
What topics to cover
NCERT Solutions
Every textbook question solved step by step
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