NCERT Solutions for Class 11 Physics Chapter 8: Gravitation covers concepts of Kepler’s Planetary Laws of Motion, Newton’s Law of Gravitation, Acceleration Due to Gravity, and its variation. Gravity, also known as Gravitational Force, is the universal force of attraction that helps to keep things together.
Class 11 Physics Chapter 8 Gravitation along with Unit 4 Work, Energy, and Power and Unit 5 Motion of System of Particles and Rigid Body has a weightage of 17 marks in the Class 11 Physics Examination. Gravity is the force that holds us onto the Earth and does not let us fly up into space. Although we barely think about it in our daily lives Gravity is essential to keep the systems operating on the Earth and the Universe.
Download PDF: NCERT Solutions for Class 11 Physics Gravitation
NCERT Solutions for Class 11 Physics Chapter 8
Class 11 Physics Chapter 8 – Basic Concepts
- Kepler’s Laws of Planetary Motion: Kepler formulated three laws to describe planetary motion – Law of Orbits, Law of areas, and Law of periods.
| 1. Law of orbits: All the planets revolve around the sun in an elliptical orbit with the sun being at one of the foci of the ellipse. |
- Newton’s law of gravitation states that each particle in the universe attracts another particle with a force that is directly proportional to the product of their masses. It is also inversely proportional to the square of the distance that exists between them.
| \(F_g = {Gm_1m_2 \over r^2}\) |
- The gravitational potential is the amount of work done in bringing a body with unit mass from infinity to a point in the gravitational field of a body.
| V = \(-GM \over R\) |
- Escape Velocity is the minimum velocity that is required to project a body vertically upward from the surface of the Earth so that it comes out of its gravitational field.
| \(v_{escape} = \sqrt{2GM \over R}\) |
- Orbital velocity is the minimum velocity required to put a satellite into a given orbit around the Earth.
| \(v_{orbital} = \sqrt{GM \over R}\) |
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