In physics, work is given a very specific meaning to describe what is accomplished when a force acts on an object, and the object moves through a distance. Specifically, the work done on an object by a constant force (constant in both magnitude and direction) is defined to be the product of the magnitude of the displacement times the component of the force parallel to the displacement. where `d` is the displacement moved in the direction of the force. The work done by a constant force on the object is the product of the magnitude of the force, the magnitude of the displacement and `cosθ`, where `θ` is the angle between the force and displacement vectors: The units of work are those of force multiplied by those of length. Therefore, the SI unit of work is the newton • meter (`N • m = kg • m^2//s^2`). This combination of units is used so frequently that it has been given a name of its own, the joule (`J`).