## NCERT Solutions for Class 11 Physics Chapter 8 – Gravitation

Physics is a subject that contrasts with the behavior of the universe and how things work like movement. Also, it is a vital part of class 11 Physics. In this, NCERT Solutions for Class 11 Physics Chapter 8. We are going to discuss the various topic of the Chapter. Moreover, this solution is in simple language.

We have prepared these NCERT Solutions for Class 11 Physics Chapter 8 which is free at Toppr. Furthermore, this solution contains all the relevant material of the chapter. Besides, these solutions will help you to grasp the concept quickly. Above all, the solution is prepared by our pioneer’s.

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### CBSE Class 11 Physics Chapter 8 Gravitation NCERT Solutions

Gravitation refers to the tendency of objects to move towards the centre of gravity that can be seen on falling. This NCERT Solutions for Class 11 Physics Chapter 8 will help you properly understand the meaning of each word. Also, the language of these solutions is so easy that it will only take you minutes to understand the topics.

### Sub topics covered under NCERT Solutions for Class 11 Physics Chapter 8

#### 8.1 Introduction

This topic talks about what we have learned about gravity earlier and what we are going to learn from this chapter. Besides, the topic quotes some example of what is gravitation. Moreover, the topic discusses various other natural phenomenon and various other things related to gravitation.

#### 8.2 Kepler’s Laws

Kepler described three laws that are related to the sun and the planet that revolves around it. These laws are stated below:

1. Law of Orbits- This law explains that all object (planet) revolves around the sun in an elliptical orbit. Moreover, the topic explains this with the help of an example.
2. Law of Areas- This law state that the line which joins any planet to the sun covers equal areas in equal intervals of time.
3. Law of Periods- This law states that the time period of a revolution of a planet is relative to the semi-major axis’s cube of the ellipse traced out by the planet.

#### 8.3 Universal Law of Gravitation

This topic explains what is the universal law of gravity in-depth. Also, what is this and how to find it? Apart from that, the topic also tells the universal law of gravity which is

F = G $$\frac{m1m2}{r2}$$

#### 8.4 The Gravitational Constant

This topic describes what is gravitational constant that we have discussed in the about topic. Moreover, the ‘G’ in the above formula is gravitational constant and its approximate value is 6.67×10-11.

#### 8.5 Acceleration Due to Gravity of The Earth

This topic defines that the earth is a sphere that is made up of a different layer of shells which exerts an equal amount of pressure on the outer shell. On the basis of this, the masses are concentrated at their common centre.

#### 8.6 Acceleration Due To Gravity Below And Above The Surface of Earth

This topic describes the above and below surface gravity that causes movement or acceleration of the earth.

#### 8.7 Gravitational Potential Energy

This topic describes the potential energy a physical object with mass has relative to another massive object. Also, the potential energy connects with the gravitational field.

#### 8.8 Escape Speed

This topic describes that if an object is thrown at a much greater speed then it can escape the gravitational pull.

#### 8.9 Earth Satellites

It refers to those objects which revolve around the earth like the moon. Moreover, their movement is quite similar to planets movement and Kepler’s laws of motion are equally applicable to them.

#### 8.10 Energy of an Orbiting Satellite

This topic explains the energy that is produced by satellite for its movement. Also, this energy is always negative.

#### 8.11 Geostationary and Polar Satellites

This topic defines the working of geostationary and polar satellites. Likewise, Geostationary satellites obit above the equator while Polar satellites work on space crafts that pass over poles.

#### 8.12 Weightlessness

This topic describes what is weightlessness and when it happens. Mostly, weightlessness happens at the time of no gravitation.

You can download NCERT Solutions for Class 11 Physics Chapter 8 PDF by clicking on the button below.

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