Class 11 Physics Chapter 7: Gravitation
Gravitation is one of the most fundamental chapters in Class 11 Physics, explaining the universal force of attraction between masses. The chapter covers Newton's Universal Law of Gravitation, gravitational field, gravitational potential, acceleration due to gravity, escape velocity, orbital motion, satellites, and Kepler's Laws of Planetary Motion. These concepts are frequently tested in JEE Main, JEE Advanced, NEET, and CBSE Board examinations.
At ALLEN, these revision notes are prepared by experienced faculty to help students master gravitational concepts through concise explanations, important formulas, solved examples, previous years' question analysis, and exam-oriented tips. Whether you are preparing for school examinations or competitive entrance exams, these notes offer a quick and effective way to revise one of the highest-scoring chapters in mechanics.
1.0Chapter Snapshot
2.0Related Supporting Resources
Continue your preparation after completing Gravitation with these additional study resources.
Practice Resources
3.0Learning Outcomes
After studying these revision notes, you will be able to:
- Apply Newton's Universal Law of Gravitation to solve numerical problems.
- Calculate gravitational force between two bodies.
- Understand gravitational field intensity and gravitational potential.
- Determine the variation of acceleration due to gravity with height and depth.
- Solve problems involving escape velocity and orbital velocity.
- Apply Kepler's Laws of Planetary Motion.
- Analyze the motion of artificial satellites.
- Strengthen concepts used in advanced mechanics and astronomy-related questions.
4.05-Minute Quick Revision
If you have only 5 minutes before your exam, revise these important concepts and formulas.
Must-Revise Concepts
- Universal Law of Gravitation
- Gravitational Constant (G)
- Gravitational Field
- Gravitational Potential
- Potential Energy
- Acceleration Due to Gravity
- Variation of g with Height
- Variation of g with Depth
- Escape Velocity
- Orbital Velocity
- Geostationary Satellites
- Kepler's Laws of Planetary Motion
Important Formula Recall
Quickly revise these formulas before solving numerical questions:
- Newton's Law of Gravitation
- Gravitational Field Intensity
- Gravitational Potential
- Potential Energy
- Acceleration Due to Gravity
- Escape Velocity
- Orbital Velocity
- Time Period of Satellite
- Kepler's Third Law
- Relation Between Orbital Speed and Radius
5.0High Weightage Topics
6.0Formula Handbook
The following formulas are essential for solving numerical and conceptual questions from Gravitation in JEE Main, JEE Advanced, NEET, and CBSE examinations.
7.0Common Mistakes & JEE Tips
Gravitation is a formula-rich chapter, but most mistakes occur because students confuse similar formulas or use the wrong radius in calculations.
8.0ALLEN Faculty Tips
- Memorize all satellite-related formulas together for quick revision.
- Learn the derivation of escape velocity to strengthen conceptual understanding.
- Practice questions on the variation of (g) with height and depth.
- Understand the relationship between orbital velocity, escape velocity, and total energy.
- Draw neat diagrams while solving satellite motion problems.
- Revise Kepler's Laws along with their practical applications.
- Solve Previous Years' Questions to improve accuracy in formula-based problems.
- Keep a separate formula sheet for gravitation as many expressions look similar.
9.0PYQ Trend Analysis
Gravitation is a consistently scoring chapter in JEE Main and JEE Advanced. Questions are commonly asked from satellite motion, escape velocity, gravitational potential, and Kepler's Laws.
Note: The trend below is based on the analysis of previous years' JEE Main and JEE Advanced question papers. The exact number of questions may vary each year.
Most Common Question Types
- Numerical problems based on Newton's Universal Law of Gravitation.
- Escape velocity and orbital velocity calculations.
- Variation of acceleration due to gravity with height and depth.
- Energy of artificial satellites.
- Conceptual questions based on Kepler's Laws.
- Gravitational field and potential comparison questions.
- Assertion–Reason and statement-based conceptual MCQs.
10.0Smart Revision Strategy
Revise this chapter in the following sequence for maximum retention:
- Universal Law of Gravitation
- Gravitational Field and Potential
- Variation of (g)
- Escape Velocity
- Orbital Velocity
- Artificial Satellites
- Kepler's Laws
- Formula Revision
- PYQs from JEE Main & Advanced
- Mixed Numerical Practice