What is force?Force is the push or pull on an object resulting from the object's interaction with another object that causes it to change velocity (to accelerate). It is called an interaction because if one object acts on another, its action is matched by a reaction from the other object. This idea is known as Newton's third law.
InputPound-force is a non-standard metric unit of force equal to the magnitude of the force exerted on one pound of mass under standard gravitational acceleration.
Kilonewton is a metric unit of force equal to 1000 Newtons.