Question

Q2. What do you understand by Free Fall. And also describe acceleration due to Gravity.

Answer 1

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$\boxed{-:Free\:Fall:-}$

Whenever object fall towards the Earth only under the gravitational force of the Earth (with no other force acting on it), we say the objects are in the state of free fall.

"Galileo found that all bodies whether light or heavy fall at the same speed towards the earth" if air resistance is neglected. Galileo dropped two stones of different masses simultaneously from the Leaning Tower of Pisa (Italy) and found that they reach the ground simultaneously. Galileo argued that air offers resistance to the objects travelling through it. If the material is dense and its surface area is small, the resistance due to air is quite small compared to the material having a large surface area.

For Example : If we throw a stone and a feather together (In outdoors) the stone will reach to the ground faster than feather because the ffeather has larger surface area than its weight, Due to this it experiences large air resistance and falls slowly.

But if we repeat this experiment in the airtight box then we will find that both will fall with same speed and reach the ground together. Here resistance due to the air is negligible in the airtight box.

Definition of acceleration due to Gravity

The acceleration with which a body Falls towards the Earth due to Earth's gravitational pull is known as acceleration due to gravity. It is represented by 'g'.

Hence, all bodies of irrespective of their masses fall down with constant acceleration.

■ It is a Vector quantity

■ Its unit is m/${s}^{2}$

■ Direction of 'g' is towards centre of the Earth.

Definition of Free Fall ::

The falling body on which only the force of gravitation of the earth at is known as freely falling body and such fall of a body is known as $\textbf{Free\:Fall.}$

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Hope this helps . . . . . . . . ☺☺

Answer 2

The acceleration which is gained by an object because of the gravitational force is called its acceleration due to gravity. Its SI unit is m/s2. Acceleration due to gravity is a vector, which means it has both a magnitude and a direction. The acceleration due to gravity at the surface of Earth is represented as g. It has a standard value defined as 9.80665 m/s

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