Question

define force..........

Answer 1

In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity

Answer 2

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It is the push or a pull that changes or tends to change the shape and size of a object.

Example:-

A football at rest has to be kicked to send it over a distance. We are exerting the force on it.

We exert a force when we push,pull,kick or lift a given object.