FHSST Physics/Work and Energy/Summary

Summary of Important Quantities, Equations and Concepts

Table 7.1: Summary of the symbols and units of the quantities used in Energy Units Quantity Symbol Unit S.I. Units Direction Work W J N.m or$kg.m^{2}.s^{-2}$ -- Kinetic Energy EK J N.m or$kg.m^{2}.s^{-2}$ -- Potential Energy EP J N.m or$kg.m^{2}.s^{-2}$ -- Mechanical Energy U J N.m or$kg.m^{2}.s^{-2}$ --

Principle of Conservation of Energy: Energy is never created nor destroyed, but merely transformed from one form to another.

Conservation of Mechanical Energy: In the absence of friction, the total mechanical energy of an object is conserved.