Post on 15-Nov-2014
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Chapter 6Chapter 6
Work, Energy, PowerWork, Energy, Power
WorkWorkThe work done by force is defined
as the product of that force times the parallel distance over which it acts.
cosFsWThe unit of work is the newton-
meter, called a joule (J)
EnergyEnergyThe amount of energy transferred to the object is equal
to the work done.
Types of Energy
• Kinetic Energy = “Motion Energy”
• Potential Energy = “Stored Energy”
Kinetic EnergyKinetic EnergyKinetic Energy is the
energy possessed by an object because it is in motion.
221 mvKE
Gravitational Gravitational Potential EnergyPotential Energy
Gravitational Potential Energy is the energy possessed by an object because of a gravitational interaction.
mghPEG
Conservation of EnergyConservation of Energy
Energy can neither be created nor destroyed, but only transformed from one kind to another.
finalinital )PEKE(W)PEKE(
PowerPower
Power is the time rate of doing work.
SpeedForce
work thisdo taken totime
force aby donework erAveragePow
PowerPower
The unit of power is a joule per second, called a Watt (W).
On to problems...