Work is performed whenever a force moves an object. When a person lifts an object, he or she is performing work. More work is done if the object is heavier or if it is lifted higher. Work, then, depends on the force acting on the object as well as the distance it is moved. The amount of work done (W) can be calculated by multiplying the magnitude of the force acting on an object (F) by the distance the object moves (d), using the equation W = F. d. Force and distance are vector quantities, that is, they have both a magnitude and a direction. The direction of the force and distance are important in work calculations, as will be discussed below. Using the English system of measurement, the force is measured in pounds (lb) and the distance is measured in feet (ft...