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The capacity to do work or cause physical change; energy, strength, or active power.
A vector quantity that tends to produce an acceleration of a body in the direction of its application.
In physics, something that causes a change in the motion of an object. The modern definition of force (an object's mass multiplied by its acceleration) was given by Isaac Newton in Newton's laws of motion. The most familiar unit of force is the pound. (See mechanics.)
Note: Gravity, and therefore weight, is a kind of force.