8: Forces Doing Work
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15 Terms
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Closed System
A system where the total energy within it remains constant
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Dissipation of Energy
Energy that is transferred to and spread out in the surroundings
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Efficiency
The ratio of useful output energy transfer to total energy input
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GPE
The store of energy that all raised matter has
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Kinetic Energy
The store of energy that all moving matter has
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Power
The rate at which energy is transferred
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resistive force
when a force opposes an object’s motion, the moving object will do work against the resistive force
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watt
the unit of power
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work done
distance travelled x force
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ways a system can transfer energy
mechanically, electrically, heating, radiation
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energy transferred =
work done
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change in GPE =
mass x gravitational field strength x change in height
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KE =
0\.5 x mass x velocity ^ 2
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power =
work done / time taken
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efficiency =
useful energy / supplied energy