Class 9 Physics Chapter 10 | Acceleration due to Gravity (g) - Gravitation

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✅ In this video,

✔️ Class: 9th
✔️ Subject: Physics
✔️ Chapter: Gravitation
✔️ Topic Name: Acceleration due to Gravity (g)
✔️ Topics Covered in This Video: Chapter 10 Gravitation - Acceleration due to Gravity (g), Calculation of Acceleration due to Gravity
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00:00 Introduction
00:32 Acceleration due to Gravity (g)
13:06 Calculation of Acceleration due to Gravity
25:46 Website overview
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Acceleration due to Gravity (g)
The falling of a body (or object) from a height towards the earth under gravitational force of earth (with no other force acting on it) and such a body is called freely falling body.

The uniform acceleration produced in a freely falling body due to gravitational force of the earth is known as acceleration due to gravity.
S. I unit = ms-2
g does not depends on the mass of the falling object or smaller masses.

Force exerted by the earth on the body.
F = GMm/R2
This force by earth produces acceleration in the stone due to which stone moves downwards.
Force = mass x acceleration
F = m x a
GMm/R2 = m x a
a = GM/R2
Here, a = g
g = GM/R2
g = (6.67 x 10-11 Nm2/kg2 x 6 x 1024 kg)/6.4 x 106 m
g = 9.8 ms-2 .

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