PHYS 114 Lecture Notes - Lecture 15: Moving Block, Braking Distance, Net Force
Document Summary
A system is a small portion of the universe. Be a collection of objects or particles. Vary with time in size and shape. A system boundary is an imaginary surface that divides the universe into. Work, w, is the amount of energy transferred by a force acting through a distance. In order to accomplish work on an object there must be a force exerted on the object, and the point of application of the force must move in the direction of the force. If the object does not move, no work is done on it. The si unit of work, j (joule), is n m, the unit of force times the unit of distance. Suppose a constant force displaces a box by d. If the force is in the same direction as d, the work done by the force on the box is. W = fd work done by a constant force.