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Edited By Vishal kumar | Updated on Sep 05, 2023 10:59 AM IST

**NCERT Solutions for Class 11 Physics Chapter 8 Gravitation** is an important chapter of the Class 11 NCERT Syllabus. If you are struggling to comprehend the concept of gravitation in class 11 or find it hard to answer questions from the NCERT textbook, Careers360 offers comprehensive NCERT solutions to all your academic needs. As we all know, all material objects are drawn towards the earth, and anything that is thrown up falls back down. Additionally, climbing uphill is more arduous than descending. To aid students in their studies, they can obtain the Gravitation Class 11 numericals with solutions for Gravitation Class 11 pdf by clicking on the provided link.

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This Story also Contains

- NCERT Solutions for Class 11 Physics Chapter 8 Gravitation
- NCERT Solutions for Class 11 Physics Chapter 8 Gravitation Additional Exercise
- More About Gravitation Class 11
- NCERT Solutions for Class 11 Physics Chapter Wise
- Physics class 11 Gravitation: Important Formulas and Diagrams
- Highlight of NCERT Solutions for Class 11 Physics Chapter 8 Gravitation
- Key features of gravitation class 11 questions and answers
- Benefits of NCERT Solutions for Class 11 Physics Chapter 8 Gravitation:
- NCERT Solutions for Class 11 Subject wise
- Subject wise NCERT Exemplar solutions

Let's assume that you are standing at the North Pole. According to you, a person standing at the south pole is inverted, still, he is not falling back why? We all know the reason that it is due to gravity. The Gravitation Class 11 solutions discuss questions based on the mathematical and physical significance of gravitation. CBSE NCERT solutions for Class 11 Physics Chapter 8 Gravitation have questions based on Kepler's Law which is important for exams like NEET and JEE Main. Kepler's Law was obtained from the observations of Galileo on planetary motions. Another two important topics of Gravitation Class 11 are escape velocity and satellites. Questions based on these concepts are also discussed in the NCERT solutions for Class 11 Physics chapter 8 Gravitation.

**NCERT gravitation class 11 exercise solutions pdf download**** **for free.

****According to the CBSE Syllabus for the academic year 2023-24, the chapter you previously referred to as Chapter 8, " Physics class 11 gravitation," has been renumbered as Chapter 7.**

**Access gravitation class 11 numericals with solutions - Exercise Questions **

** Q: 8.1 (b) ** Answer the following :

** Answer: **

Yes if the size of the space station is large then he can detect gravity.

** Q: 8.1 (c) ** Answer the following:

** Answer: **

Apart from the gravitational pull, the tidal effect also depends upon the cube of the distance between the two. Since the distance between earth and sun is much larger than the distance between the sun and moon so it not also balances but is more than the effect of gravitational force. Thus the tidal effect of the moon’s pull is greater than the tidal effect of the sun.

** Q: 8.2 ** Choose the correct alternative :

(a) Acceleration due to gravity increases/decreases with increasing altitude.

(b) Acceleration due to gravity increases/decreases with increasing depth (assume the earth to be a sphere of uniform density). (c) Acceleration due to gravity is independent of mass of the earth/mass of the body.

(d)The formula is more/less accurate than the formula for the difference of potential energy between two points and distance away from the centre of the earth.

** Answer: **

(a) Acceleration due to gravity ** decreases ** with increasing altitude.

The relation between the two is given by :

(b) Acceleration due to gravity ** decreases ** with increasing depth.

The relation is given below:

(c) Acceleration due to gravity is independent of the ** mass ** of the body.

Here M is the mass of the earth.

(d) The formula is **more** accurate than the formula for the difference of potential energy between two points and distance away from the centre of the earth.

** Answer: **

Time taken by planet to complete a revolution around sun =

Using Kepler's law of planetary motion we can write :

or

or

Thus the planet is 0.63 times smaller than earth.

** Q: 8.4 ** Io, one of the satellites of Jupiter, has an orbital period of days and the radius of the orbit is . Show that the mass of Jupiter is about one-thousandth that of the sun.

** Answer: **

The orbital period in days is

Mass is given by :

Thus the ratio of the mass of Jupiter and mass of the sun is :

or

or

Thus the mass of Jupiter is nearly one-thousandth that of the sun.

** Answer: **

We know that one light year is .

The time period of rotation is given by :

Putting all the value (in SI units) in the above equation we get :

or

In years :

** Q: 8.6 ** Choose the correct alternative:

** Answer: **

(a) The total energy will be negative of its ** kinetic energy ** . Since at infinity potential energy is zero and total energy is negative.

(b) The energy required will be ** less ** as the stationary object on earth has no energy initially whereas the satellite has gained energy due to rotational motion.

** Answer: **

The escape velocity from the earth is given by :

Since the escape velocity depends upon the reference (potential energy), so it only depends upon the height of location.

(i) No

(ii) No

(iii) No

(iv) Yes

** Answer: **

Among all only angular momentum and total energy of the comet will be constant other all factors given will vary from point to point.

** Answer: **

(a) In space we have state of weightlessness, so the swollen feet does not affect astronaut as there is no gravitational pull (so cannot stand).

(b) The swollen face will be affected as the sense organs such as eyes, ears etc. will be affected.

(c) It will affect the astronaut as it may cause mental strain.

(d) It will affect the astronaut as space has different orientations.

** Answer: **

We know that the gravitational potential (V) in a sphere is constant throughout. Also, the gravitational intensity will act in the downward direction as its upper half is cut (gravitational force will also act in a downward direction). Hence the required direction of gravitational intensity is shown by arrow ** C ** .

** Answer: **

As stated in the previous question, the gravitational potential in a spherical shell is constant throughout. So the gravitational intensity will act in downward direction (as upper half is cut). So the required direction is shown by arrow ** e ** .

** Answer: **

Let the distance where the gravitational force acting on satellite P becomes zero be x from the earth.

Thus we can write :

or

or

Hence :

(Since r = )

** Answer: **

Mass of sun can be calculated by using the following formula:-

Putting the known values in the above formula, we obtain :

or

Thus the mass of the sun is nearly _{} .

** Answer: **

Kepler's third law give us the following relation :

Thus we can write :

or

or

or

Thus the distance between the sun and Saturn is .

** Answer: **

Acceleration due to gravity at height h from the surface of eath is :

For we have :

or

Thus the weight of the body will be :

or

or

** Answer: **

Position of the body is (depth) :

Acceleration due to gravity at depth d is given by :

or

or

Thus the weight of the body is:-

or

or

Thus the weight of the body is 125 N.

** Answer: **

The total energy is given by :

Total energy = Potential energy + Kinetic energy

At the highest point velocity will be zero.

Thus the total energy of the rocket is :

Now we will use the conservation of energy :

Total energy initially (at earth's surface) = Total energy at height h

or

or

or

or

Hence the height achieved by the rocket from earth's centre = R + h

or

** Answer: **

Let us assume the speed of the body far away from the earth is .

Total energy on earth is :

And the total energy when the body is far from the earth is :

(Since the potential energy at far from the earth is zero.)

We will use conservation of energy : -

or

or

or

or

** Answer: **

The total energy of the satellite at height h is given by :

We know that the orbital speed of the satellite is :

Thus the total energy becomes :

or

Thus the required energy is negative of the total energy :

nbsp;

or

or

** Answer: **

The total energy of stars is given by :

or

or

Now when starts are just to collide the distance between them is 2R.

The total kinetic energy of both the stars is :

And the total energy of both the stars is :

Using conservation of energy we get :

or

or

or

Thus the velocity is : _{}

** Answer: **

Gravitational force at the midpoint will be zero. This is because both spheres are identical and their forces will be equal but opposite in direction.

The gravitational potential is given by :

or

At the midpoint, we have equal forces in the opposite direction so it is in equilibrium but if we move the body slightly then the particle will move in one direction (as one force will be greater). So it is an unstable equilibrium.

** Answer: **

Height of satellite from earth's surface :

Gravitational potential is given by :

or

or

Thus potential due to earth gravity is _{ . }

** Answer: **

A body will get stuck at the star's surface if the centrifugal force of star is less than the gravitational force.

The gravitational force is given by :

or

The centrifugal force is given by :

or

or

As we can see that the gravitational force is greater than the centrifugal force thus the body will remain at the star.

** Answer: **

Firstly, the potential energy of spaceship due to the sun is given by :

and the potential energy of spaceship due to mars is given by :

It is given that the spaceship is stationary so its kinetic energy is zero.

Thus the total energy of spaceship is :

Thus the energy needed to launch the spaceship is :

or

or

or

** Answer: **

The kinetic energy of the rocket is (initial):-

And the initial potential energy is :

Thus total initial energy is given by :

Further, it is given that 20 per cent of kinetic energy is lost.

So the net initial energy is :

The final energy is given by :

Using the law of energy conservation we get :

Solving the above equation we get :

or

or

or

or

Thus the required distance is 495 Km.

Gravitation solutions class 11 consist of a total of twenty-five questions, in which questions number 22,23,24 and 25 belong to the additional exercises. NCERT Solutions for Class 11 Physics Chapter 8 Gravitation provides step-by-step explanations for all the questions and exercises given in the textbook. These gravitation class 11 ncert solutions are prepared by subject matter experts who have extensive knowledge of the concepts covered in the chapter.

You will study the unit electrostatics in NCERT Class 12 physics, so, while studying Electrostatics chapter you can compare the formula with the formulas that you will study in Gravitation Class 11. NCERT solutions can make your learning easy if you are want to prepare for other classes too. The main NCERT topics of the chapter are listed below

Chapter 1 | |

Chapter 2 | |

Chapter 3 | |

Chapter 4 | |

Chapter 5 | |

Chapter 6 | |

Chapter 7 | |

Chapter 8 | Gravitation |

Chapter 9 | |

Chapter 10 | |

Chapter 11 | |

Chapter 12 | |

Chapter 13 | |

Chapter 14 | |

Chapter 15 |

Some of the important gravitation chapter class 11 formula are given below:

**Gravitational Force-**

**Acceleration Due to Gravity (g)**-

**Gravitational Potential-**

** or **

**Work Done Against Gravity-**

**Escape Velocity-**

**Kepler's Laws-**

**Energy of Satellite-**

Here are some of the highlights of the gravitation class 11:

**Newton's law of gravitation:**class 11 physics chapter 8 begins with an introduction to the concept of gravity and Newton's law of gravitation, which states that every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.**Gravitational field:**chapter 8 physics class 11 goes on to explain the concept of a gravitational field, which is the region in space around a massive object where the force of gravity is felt. The strength of the gravitational field is proportional to the mass of the object and decreases with distance from the object.**Gravitational potential energy:**The gravitation chapter class 11 also covers the concept of gravitational potential energy, which is the energy possessed by an object due to its position in a gravitational field.**Kepler's laws of planetary motion:**ncert gravitation class 11 includes an introduction to Kepler's laws of planetary motion, which describe the motion of planets around the sun.**Escape velocity:**Class 11 physics gravitation exercise concludes with the concept of escape velocity, which is the minimum velocity an object needs to escape the gravitational pull of a massive object.

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Download EBookThese are some of the key highlights of the gravitation class 11 exercise solutions.

**Comprehensive Coverage**: The class 11 physics gravitation exercise solutions cover all the important topics and questions presented in the chapter, ensuring a thorough understanding of the subject matter.

**Step-by-Step Explanations:** Each question is accompanied by a detailed step-by-step solution, making it easier for students to follow and learn the concepts.

**Clarity and Simplicity: **The gravitation class 11 ncert solutions are explained in clear and simple language, making complex concepts more accessible to students.

**Diagrams and Graphs: **When necessary, diagrams and graphs are included to visually illustrate concepts and enhance comprehension.

**Numerical Problem Solving: **Practice with solving numerical problems related to gravitational forces, orbital mechanics, and escape velocities, helping students develop problem-solving skills.

**Conceptual Clarity: **The gravitation class 11 questions and answers aim to build a strong conceptual foundation, allowing students to grasp the fundamental principles governing the motion of celestial bodies.

Numerical problems and derivations of the chapter are important. The solutions of NCERT class 11 physics chapter 8 gravitation will help in the final exam and also in competitive exams. For exams like NEET and JEE Main, one or two questions are expected from the chapter gravitation and the NCERT solutions for Class 11 will help in solving the questions asked in such exams.

- NCERT Books Class 11 Physics
- NCERT Syllabus Class 11 Physics
- NCERT Books Class 11
- NCERT Syllabus Class 11

1. What is the weightage of the chapter Gravitation for NEET

One question can be expected from the NCERT chapter Gravitation for NEET exam. The concepts studied till chapter 7 of Class 11 NCERT books may be used to solve problems of chapter Gravitation. Study all the formulas from Gravitation NCERT Notes. And solve more questions using NEET previous year papers and NCERT exemplar.

2. What is the weightage of the chapter gravitation for JEE Main

one question from the chapter gravitation can be expected for JEE Main exam. Some times it can be two also. Grasp all the concepts and formulas of Mechanics well to solve the problems in JEE Main.

3. Does Careers360 website provide the class 11 physics chapter 8 ncert solutions?

Yes, these solutions can be viewed online or student can gravitation class 11 ncert solutions pdf.

4. What is the SI unit of Gravitation?

The SI unit of gravitation is Newton (symbol: N).

5. Is it possible to shield a body from gravitational effects?

No, it is not possible to shield a body from gravitational effects.

6. Is gravitation numericals class 11 important ?

Yes, gravitation numericals in Class 11 Physics are important as they deepen conceptual understanding and are often featured in exams like board exams and competitive tests, influencing overall performance.

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