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##### Work Power and Machines

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**Work Power and Machines**Notes**Work**• The transfer of energy to an object when a force makes it go in the direction of the force.**Work is Done When…**• An object gets kinetic energy from an applied force • An object moves in the same direction as the force • Only when force is applied**Work is not done when…**• An object does not move despite force applied • An object moves but in a different direction than the force**The Amount of Work Done…**• W = F * D (work = force times distance) • Unit of measure = Joules (J) • Is the same if: • driving up a road (less force, more distance) and • straight up a cliff (more force, less distance)**Power = the rate of work**• P = W / T (power equals work divided by time) • Unit of measure is Watts…(Joules per second) • If work is done faster then more power is used… • sanding wood by hand vs. using a power tool