PHYS 1003 Lecture Notes - Lecture 10: Conservative Force, Electric Field, Maxima And Minima
12 Oct 2016
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Document Summary
Rate at which work is done/energy is used in a system. Unit is watt (w) derived from (j/s) (1 watt = 1j/s) Importance: determines how long it takes to accomplish the task: 1h. p = 746 watts. Power is related to the scalar of the force and constant velocity. Potential energy is stored if a system changes state: height in gravity field, moves in electric field, spring is compressed or extended. Related to the work done by an internal force when the object changes state. Elastic potential energy where x is the displacement from the equilibrium. Total work done by a force around a loop must be zero. Force has potential energy only if it as a conservative force. Transforming a scalar field into a vector quantity (potential energy to force) The change in gravitational potential energy is proportional to the change is height.
