Work, Energy Power
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8 Terms
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Work done
Work done = force × distance moved in the direction of the force
W=Fx
Units: joules(J, =Nm)
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Gravitational potential energy
Ep = mgh
The capacity for doing work as a result of an objects position in a gravitational field
Units: joules(J, =Nm)
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Kinetic energy
Ek = ½ mv²
Energy associated with an object as a result of its motion
Units: joules(J, =Nm)
Ek α m
Ek α v²
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Power
Rate of work done
P=W/t
P=E/t
Units: watts(W, =Js-1)
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Efficiency
Efficiency = (useful output energy) / (toatal output energy) × 100
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Smooth surface
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The principle of conservation of energy
The total energy of a closed system remains constant - energy cannot be created nor destroyed
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Deriving the equation for kinetic energy