please provide useful notes of chapter gravitation class 9 please don't text useless things only written notes
Answers
Newton’s Law of gravitation states that every object in the universe attracts every other object by a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
⇒⇒F∝M∗m
⇒Fα1d2
⇒F=GMmr2 where G is the universal gravitation constant.
⇒ Value of G = 6.673∗10−11Nm2Kg−2
For More Information On Gravitation, Watch The Below Videos:
The Moon’s Falling – Moon’s revolution around Earth
The moon revolves around Earth due to centripetal force, which is the force of gravity of the Earth. If the force of attraction between Earth and moon ceases, then the moon will continue to travel in a straight line path tangential to its orbit around Earth.
For More Information On Why Moon Does Not Falls, Watch The Below Video:
When a body undergoes circular motion, it experiences a force that acts towards the centre of the circle. This centre-seeking force is called a centripetal force.
Freefall and Motion
When an object is under free fall, acceleration due to gravity is constant at g = 9.8ms−2.
Value of g does not depend on mass i.e any object big or small experiences the same acceleration due to gravity under free fall. All three equations of motion are valid for freely falling objects as it is under uniform motion.
When a body undergoes circular motion, it experiences a force that acts towards the centre of the circle. This centre-seeking force is called a centripetal force.
Freefall and Motion
When an object is under free fall, acceleration due to gravity is constant at g = 9.8ms−2.
Value of g does not depend on mass i.e any object big or small experiences the same acceleration due to gravity under free fall. All three equations of motion are valid for freely falling objects as it is under uniform motion.
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