Class 11 Physics Ch 8

Gravitation Class 11 Physics Chapter 8 Notes

Class 11 Notes Chapter 8 Revision Notes 
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The revision notes for Class 11 Physics are designed to provide students with a comprehensive understanding of the subject matter. These notes have been meticulously crafted by expert teachers who have taken into account the latest CBSE Syllabus for the academic year 2023-24. 

The notes cover a wide range of important topics and concepts, including Work, Energy, and Power, Thermal Properties of Matter, Rotational Motion, Thermodynamics, Kinetic Theory, Gravitation, and Laws of Motion, among others. By referring to these notes, students can gain a clear and thorough understanding of the subject matter, thereby enhancing their academic performance.

CBSE Class 11 Chapter-wise Physics Notes

Class 11 physics Chapter 8  Gravitation is an important study material for the Students who are presently studying in CBSE 11th standard. PW provides comprehensive Gravitation Class 11 Notes that will not only help you score high in the Class XI exam but will also help you prepare for competitive tests. With careful research on the most recent CBSE syllabus, our subject specialists have presented the most significant subjects of the Gravitation Chapter, which are given below.

Key Notes for CBSE NCERT based Class 11th Physics

 The NCERT Results for Class 11 physics are matter experts according to the latest CBSE Syllabus 2023-24 and its marking schemes. Gravitation  Physics Class twelve NCERT PDF can come easy to understand  while preparing notes and during  different Exams. Class 11 physics Chapter 
8 Solutions from the link attached below at free or no cost.  

We offer complimentary access to Toppers' Notes for all chapters of Class XI Physics, available in PDF format. These notes serve as a valuable resource for students seeking to revise quickly during exams, as they contain keynotes on important topics and concepts.

CBSE Class 11 Physics Chapter 8 Gravitation Notes  

Gravitation: It is a force due to which all things are attracted towards the earth. This force is known as Gravitation.

• Gravitation is the force of attraction between all masses in the universe, especially the force of attraction exerted by the earth on all the bodies near its surface.

Kepler's Laws:

> Kepler's 1 Law: Law of Orbits

Statement: - The orbit of every planet is an ellipse around the sun with sun at one of file two foci of ellipse.

Kepler's 2nd law: Law of Areas

Statement: -The line that joins a planet to the sun sweeps out equal areas in equal intervals of time. 

 Statement: According to this low the square of time period of a planet is directly proportional to the cube of the semi-major axis of its orbit. ⚫ (In ellipse semi-major axis is same as radius of the circle)

Universal Law of Gravitational:

Universal law of Gravitation states - Every single body in this universe attracts each other with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

⚫This law holds good for all the bodies in the universe. 

If the product of mass of the bodies increase the force of attraction also increases between them and if the square of the distance between the bodies increases, force decreases.


• Consider 2 boxes having mass me and me. The distance between them is r

Where G = universal Gravitational constant. Its value is constant and it never 

Gravitational Constant: Cavendish experiment

To calculate the value of 6. Cavendish took a wooden plank and attached two balls on either side of the plank and hung this with a thin thread from the top. He introduced 2 very big balls and those balls are near the smaller bails Schematic drawing of Cavendish's experiment:-
Si and 5, are large spheres that are kept other side of the ellipse.

• When the big spheres are taken to the other side of the ellipse (shown by dotted circles), the bar AB rotates a little since the torque reverses direction, The angle of rotation can be matured experimentally

⚫ He observed that: -Plank rotates till twisting force becomes equal to the gravitational force between the balls. This happened become force of attraction between the small balls e equation, he calculated the value of 6.

Acceleration due to gravity of the earth • All the objects fall towards the earth because of gravitational pull of the earth. And when a body isfalling freely, it will have some velocity and therefore it will attain some acceleration. This acceleration is known as acceleration due to gravity

⚫ It is a vector quantity.

• Denoted by 'g!
Its value is 9.8m/s. and bigger balls.
point Expression for Acceleration due to gravity

• Consider any object of mass 'm' at a point A on the surface of the earth. The force of gravity between the body and earth can be calculated as

F =Gm M./R₂ (1) where

m-mass of the body M.-mass of the Earth

R= distance between the body and the earth is same as the radius of the earth

Newton's Second law states that

F=ma (2)

Comparing the equations (1) and (2)

F = m (6 m M./R)

⚫ (&m M./R.) is some as g (acceleration due to gravity) • Therefore, the expression for Acceleration due to gravity

⚫gnG M./R.

Acceleration due to gravity above the surface of earth given figure shows the value of acceleration due to gravity 9 at a height h above the surface of the earth study Force of gravitation between the object and the earth will be 
To calculate the value of acceleration due to gravity of point mass in at a height h above the surface of the earth.

FG mM/(Rh  

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