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Work

Work. The Physics Classroom on Work The amount of force applied to move an object Force and distance MUST be PARALLEL to each other Work = Force*distance Units - J(joule)=N*m (+) – force and distance in same direction (-) – force and distance in opposite directions. Power.

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Work

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  1. Work • The Physics Classroom on Work • The amount of force applied to move an object • Force and distance MUST be PARALLEL to each other • Work = Force*distance • Units - J(joule)=N*m • (+) – force and distance in same direction • (-) – force and distance in opposite directions

  2. Power • The rate at which work is done. • P = W/t = F*d/t = Fv • Watts (W) = J/s

  3. Energy • Kinetic • Energy associated with moving objects • ½ mv2 • Units of Joules (J) • Worknet = KE • Potential • Amount of energy that is stored; has the potential of changing • Gravitational based upon height GPE = mgh • Elastic in a spring or stretched object EPE = ½ kx2 Units of Joules (J)

  4. Mechanical Energy • ME = KE + PE • ME is conserved; there is no loss or gain of energy – law of conservation of energy • This is only true in the absence of friction

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