The net work W net is the work done by the net force acting on an object The SI unit for work and energy is the joule (J), where 1 J = 1 N ⋅ m = 1 kg ⋅ m 2 /s 2

The work done by a force is zero if the displacement is either zero or perpendicular to the force Work done on an object transfers energy to the object

work — the transfer of energy by a force that causes an object to be displaced; the product of the component of the force in the direction of the displacement and the magnitude of the…. work done by a force — zero if the displacement is either zero or perpendicular to the force. kinetic energy — the energy an object has by reason of its motion, equal to 1 2 mv 2 for the translational (i.e., non-rotational) motion of an object of mass m moving at speed v. work done — positive if the force and displacement have the same direction, and negative if they have opposite direction.