1.

what are (i) free fall, (ii) acceleration due to gravity (iii) escape velocity (iv) centripetal force?

Answer»

(i) Free fall:

Whenever an object moves under the influence of the force of gravity alone, it is said to be falling freely.

(ii) Acceleration due to gravity:

The acceleration produced in a body due to the gravitational force of the earth is called the acceleration due to gravity.

[Note: On the earth’s surface, the value of the acceleration due to gravity is almost uniform. If a body falls from a low altitude, the value of the acceleration due to gravity is almost the same.]

(iii) Escape velocity:

When a body is thrown vertically upward from the surface of the earth, the minimum initial velocity of the body for which the body is able to overcome the downward pull by the earth and can escape the earth forever is called the escape velocity.

(iv) Centripetal force:

In uniform circular motion of a body, the force acting on the body is directed towards the centre of the circle. This force is called centripetal force.


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