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# NCERT Books Free Download for Class 11 Physics Chapter 8 – Gravitation

Last updated date: 12th Jul 2024
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## NCERT Books for Class 11 Physics Chapter 8 - Gravitation - Free PDF Download

Free NCERT Books download for Class 11 Physics Chapter 8 - Gravitation on Vedantu.com. Students can also download the NCERT Textbooks Solutions in PDF for Class 6 to 12 all subjects. Register for Physics tuition to clear your doubts and score more in your exams.

Learning the basics of any subject is a must before mastering the subject. This also applies to Class 11 and beyond. Study of Class 11 subjects sets the stage for choosing your career after the Board exams in the next standard i.e. Class 12.

Studying the subject of Gravitation in Physics in Class 11 may appear to be quite tough. But using NCERT Books, the students can easily master Physics Chapter 8  on Gravitation.

Chapter 8 of Class 11 on Gravitation in NCERT Book can be easily downloaded. The many free downloads of practice questions and solutions are also available for adequate preparation.

Competitive Exams after 12th Science

## Brief on Class 11 Physics Chapter 8 – Gravitation

The Chapter on Gravitation deals with laws like Kepler’s Laws, such as Law of orbits, Law of areas and Law of periods, Newton’s Universal Law of Gravitation, Central Forces and  acceleration due to gravity of the earth.

### Kepler’s Laws

The Law of Orbits by Johannes Kepler states that all planets move in elliptical orbits with the Sun situated at one of the foci of the ellipse. This was different from the earlier theory by Copernicus that the planets move around in circles around a fixed sun.

The Law of Areas by Kepler states that the line joining any planet to the sun sweeps equal areas in equal intervals of time. This explains the fact that planets appear to move slower when they are farther from the sun than when they are nearer.

The Law of Periods States that the square of time period of revolution of a planet is proportional to the cube of the semi-major axis of the ellipse traced out by the planet. This law is a consequence of conservation of angular momentum which is valid for any central force on the planet acting along the vector joining the Sun and the planet.

### Universal Law of Gravitation

Newton’s law of gravitation, states that everybody in the universe attracts every other body with a force varying directly as the product of the masses and inversely as the square of the distance between them. The force F on a point mass m2 due to another point mass m1 has the magnitude | F | = G m1 m2/ r2 where G is the universal gravitational constant. The currently accepted value of G after experiment of Henry Cavendish is,

G=6.67x1011 N m2/kg2

### Acceleration Due to Gravity of The Earth

Acceleration due to gravity of the earth is the acceleration gained by an object due to gravitational force of the earth. It has both magnitude and direction. It is represented by g and its SI unit is m/s2. The standard value of g on the surface of the earth at sea level is 9.8 m/s2.

The acceleration experienced by a mass at point P under the earth surface is,

g=F/m = GME / R2E where F is force, RE is the radius of the earth, ME the mass of the earth and G universal gravitational constant.

The chapter also explains the acceleration due to gravity below and above the surface of the earth. In addition, the chapter deals with gravitational potential energy and the work required to be done to lift a point mass from the surface of the earth to another point vertically above the point at a height h.

W12=Force x displacement =mg (h2-h1)

The value of acceleration due to gravity ‘g’ is affected by

• Altitude above the earth’s surface.

• Depth below the earth’s surface.

• The shape of the earth.

• Rotational motion of the earth.

### Importance of Newton’s Law of Gravitation

The gravitational force of the earth ties the terrestrial objects to the earth. This law explains the attractive force between any two objects having a mass. The formation of tides in the ocean is due to the force of attraction between the moon and ocean water.

## FAQs on NCERT Books Free Download for Class 11 Physics Chapter 8 – Gravitation

1. How to download NCERT Books on Class 11 Chapter 8 Gravitation?

• First, visit the tab of the NCERT website.

• From the Home page of the official website of NCERT and go to Students tab and then to e-textbooks tab.

• Next, from this tab, Select class, Class 11 and from the tab of Select Subject, Choose Physics –I followed by Selecting Book Title of Physics –I Gravitation.

By clicking on Chapter 8 of the Class 11 will lead you to the chapter on Gravitation in the NCERT book.

2. What are NCERT Exemplars for Class 11 Chapter 8 on Gravitation?

NCERT Exemplars is a set of simple practice books meant for in-depth learning with questions of a higher level. The book describes relevant concepts, gives a general overview of the likely questions and contains Multiple Choice Questions as well as skill-developing questions. The Exemplars are indeed among the best resources for the preparation of JEE Mains and Advanced Entrance Exams. Solving the questions in the Exemplars is crucial before you attempt CBSE Board questions and prepare for the Entrance Competitive Exams.

3. How to revise for the Class 11 Physics exams?

The easy availability of details of Class 11 Physics from Vedantu.com website in well-structured formats enables the students to acquire and practise such learning methods as to ensure proper understanding of the concepts and their details. Apart from this website, the students can download the chapters of Physics of 11thStandard from epathshala.nic.in.

Besides, Revision Notes and Important Questions can be easily found at the Vedantu website or the Vedantu App to practise and score well in the examinations. All the study materials provided at the website can be downloaded free of cost.

4. Do I need to practise all Question Papers on the website?

It is always advisable to solve all the exercises at the end of each chapter as they provide plenty of practice. Physics is not a subject that one can just read and memorize. It requires hard work, application of mind and practice. The NCERT textbook has examples and exercises after every section to help you in this regard.

After going through each section, please go through the solved examples and understand them completely. Then move on to the exercises and try to complete them. Often, there are chances of the same questions being asked in the examination. The students are also well-advised to learn the equations and formulae and their derivations in the exercises.