Question

Define force and give its standard unit

Answer 1

Force is an action that causes a free object with nonzero, finite mass to accelerate, relative to a non-accelerating frame of reference. The standard unit of force is the newton. 

Answer 2

Heya !

Force is the push or pull that changes or tends to change the speed of a moving object or bring it to rest. It can also change the speed , shape and size of a object. Force has no effect on mass. Mass remains constant

SI unit of force = Newton (N)

Thanks !