What is Force?

Force A force is a push or a pull. [1] Since push or a pull has both magnitude and direction, so that force is a vector quantity. [2] Forces occur in pairs. If object $A$ exerts a force on object $B$, then $B$ also exerts a force on $A$. For example, when a bat strikes a ball the bat exerts a force on the ball, but the ball exerts a force on the bat also. [3] A force can cause an object to accelerate. If you kick a foot ball the ball's velocity changes while your foot is in contact with it. [4] ...