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NCERT Exemplar Class 11 Physics Chapter 8 Solutions: Gravitation

NCERT Exemplar Solutions for Class 11 Physics Chapter 8 reveals the concept that the gravitational force of Earth is responsible for attracting the objects in the air towards itself. A free-falling object under the effect of NCERT Exemplar Class 11 Physics gravitational force changes its velocity at various time periods. As a result, the free-falling object in the direction of the Earth is supposed to have attained ‘acceleration due to gravity’.

Chapter 8 – Gravitation has around 5 exercises with a total of 38 exemplar problems based on Newton’s law of gravitation, acceleration due to gravity, Kepler’s law of planetary motion, and gravitation field and its intensity. There are different types of questions available for practice including short answer type questions, long answer type questions, and multiple-choice questions based on the concepts of gravitation.

While some questions are difficult to understand on the first go. At Instasolv, we always try our best to provide step-by-step solutions for the exercise questions to you. Performing these questions and answers will help you to score high marks in CBSE class 11 physics exams. You can follow the NCERT Exemplar Class 11 Physics Problems and Solutions provided by Instasolv from anywhere and at any time.

Important Topics for NCERT Physics Exemplar Solutions Class 11 Chapter 8 – Gravitation

What is Gravitation?

Gravitation is a certainly occurring sensation or a force which exists among all physical objects in the universe.

What is Newton’s Law of Gravitation?

The newton’s law of universal gravitation illustrates us that the gravitational force (F) of attraction between two material let their masses be (m1) and (m2), divided by the distance (r)

F = Gm1m2/ r2

What is Kepler’s Law of Planetary Motion?

Kepler’s laws of planetary motion state that:

  • All planets move in oval orbits with the Sun at one of the focal points
  • The radius vector marked from the Sun to a planet bends out similar areas at similar time intervals. This follows from the statement that the force of gravitation on the planet is central and therefore angular momentum is preserved.
  • The square of the orbital period of a planet is relational to the cube of the semi-major axis of the oval orbit of the planet.

Earth Satellite

A satellite is a body that has been sent into space in order to gather data or to be part of a communications system. Satellites move constantly around the Earth or around another planet. Earth has one large ordinary satellite, called the Moon.

Geostationary and Polar Satellites

Geostationary Satellites are the satellites having a spherical orbit that lies in the plane of the earth’s equator. In the case of polar satellites, the orbital plane consists of the Earth’s axis so the satellite passes over the poles of the Earth.

The Energy of an Orbiting Satellite

The energy of an orbiting satellite is called the binding energy of that satellite. We found that the kinetic energy is GmM/ 2r and the potential energy is – GmM/ r, where G is the universal gravitational constant, M is the mass of the planet, m is the mass of the satellite and r is the distance of the satellite.

Exercise-wise Discussion of NCERT Physics Exemplar Solutions Class 11 Chapter 8 – Gravitation

Exercise 8.1 – Multiple Choice Questions I

The first exercise of the chapter has around 8 questions which are multiple-choice questions. These questions are based on Newton’s law of gravitation, acceleration due to gravity, Kepler’s law of planetary motion, and gravitation field and its intensity.

Exercise 8.2 – Multiple Choice Questions II

This exercise has around 8 questions in which you need to choose the right answer from the options given.

Exercise 8.3 – Very Short Answer Types Questions

Exercise – 8.3 of Chapter 8 – Gravitation has around 11 very short answer type questions. These questions are based on the main topics of the chapter including escape speed, earth satellites, geostationary and polar satellites, and the energy of an orbiting satellite.

Exercise 8.4 – Short Answer Type Questions

This exercise has around 6 questions which are completely related to the concept that the gravitational force of Earth is responsible for attracting the objects in the air towards itself.

Exercise 8.5 – Long Answer Type Questions

This exercise set has a total of 5 questions which are long answer type questions and you need to provide a detailed explanation in these questions. 

Why Use NCERT Physics Exemplar Solutions Class 11 Chapter 8 – Gravitation by Instasolv?

  • These NCERT Exemplar Class 11 for physics chapter 8 can be accessed and referred at any time and at any place.
  • These solutions also cover all the questions that are included in the Class 11 Physics NCERT Exemplar textbook chapter 8. 
  • NCERT Exemplar Problems Class 11 Physics Solutions are given in easy steps to help you understand the concepts better.
  • Practising these solutions will also help you to understand different types of questions asked in the exams as well as their marking scheme.
  • Formulas are mentioned in-between steps to help you revise them easily while solving the questions.