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Gravitation — Chapter Summary

NIOS · Class 12 · Physics

Summary of Gravitation for NIOS Class 12 Physics. Key concepts: Every particle in the universe, The acceleration produced and At a height h above Earth's.

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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Overview

Gravitation is one of the most fundamental forces in nature. Every object in the universe attracts every other object — this is the essence of Newton's Universal Law of Gravitation. From the apple falling from a tree to the moon orbiting the Earth, and from planets revolving around the Sun to artifi

Key Concepts

Every particle in the universe attracts

Every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely p

The acceleration produced in a body

The acceleration produced in a body due to the gravitational pull of the Earth is called acceleration due to gravity (g). Using Newton's Second Law (F

At a height h above Earth's

At a height h above Earth's surface, the distance from Earth's centre becomes (R + h). Therefore: g_h = GM/(R+h)² = g/(1 + h/R)². For small heights (h

At a depth d below Earth's

At a depth d below Earth's surface, a particle is attracted only by the inner sphere of radius (R - d), as the gravitational effect of the outer shell

Earth rotates about its axis

Earth rotates about its axis, so every point on its surface (except poles) undergoes circular motion. A portion of gravity is used as centripetal forc

Learning Objectives

  • State and apply Newton's Universal Law of Gravitation with its mathematical form F = Gm₁m₂/r²
  • Calculate the acceleration due to gravity (g) at the surface of the Earth and other celestial bodies using g = GM/R²
  • Analyse how the value of g varies with altitude (height), depth below Earth's surface, and latitude
  • Distinguish clearly between gravitational potential (V = -GM/r) and gravitational potential energy (U = -GMm/r)
  • Differentiate between mass and weight, and understand why weight varies while mass remains constant

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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All NIOS Class 12 Physics Chapter Summary

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