Definitions The scientific definition of work is a force exerted over a distance (work = force · distance) work - The scientific definition of energy is.

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Definitions The scientific definition of work is a force exerted over a distance (work = force · distance) work - The scientific definition of energy is the ability to do work energy - The scientific definition of power is the rate at which work is done (power = work  time) power -

The equation depends on the type of energy Equations and Units work You must use the force component in the direction of the d when determining the work Equation  W = F · d Unit  joule {1 J = 1 N · m } energy Equation  The equation depends on the type of energy Unit  joule or kilowatt·hour {1 kW·hr = 3,600,000 J } power Equation  P = W  t Unit  watt {1 watt = 1 J/s } or horsepower {1 hp = 746 watts }

Types of Mechanical Energy energy of motion ( KE = 1/2 mv2 ) KINETIC ENERGY (KE) - moving objects, sound waves POTENTIAL ENERGY (U) - stored energy There are two types of mechanical stored energy: Gravitational potential energy (UG) - energy stored by gravity ( UG = mgh ) wrecking ball GPE is always a negative and large number when we look at the Earth and an object near its surface – usually, we’re concerned with changes in GPE in a given system, thus mgh. Elastic potential energy (Us) - energy stored by an elastic medium ( US = ½ kx2 ) where: k = spring constant x = amount of stretch or compression rubber band

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