Question

what are the changes possible on an object at rest if we apply on it : (a) a balanced force. (b) an unbalanced force

Answer 1

Hey mate... Here is your answer:

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(a) Object may change its shape or size.

(b) Object changes its velocity, that is it accelerates.

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Answer 2

(a)....

When object is in equilibrium, The total force acting on it is zero.

so object has zero acceleration.

It means that object can be at rest or it can move with a constant velocity.

(b)

when an unbalanced force is acting on it,
The object will move with a constant acceleration in the direction of the resultant force .