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An OverviewWorkPotential & Kinetic EnergyEnergy Sources
PetroleumCoalWaterNuclearSolarWindGeo-thermal
Energy
Energy – Geo-thermal
Energy – Geo-thermal
Energy – Geo-thermal
Energy – Geo-thermal
Energy – Geo-thermal
Energy – Geo-thermal
Energy – Geo-thermal
Energy – Geo-thermal
Energy – Geo-thermal
Energy – Geo-thermal
Energy – Geo-thermal
Energy – Geo-thermal
WorkTo understand WORK – we must understand
forceForce
An interaction between objects that is capable of changing the objects state of motion (rest/moving)
F=ma
Energy
Force Work Power Energy F=ma
m=F/aa=F/m
Energy
Work (Mechanical)A function of force and distance
Application of a force to an object and the distance the object moves
W = F x dUnit of measurement – foot pound (ft lb)
Energy
Force Work Power Energy F=ma W=Fd
Energy
Important criteria for Work:1. Something must move2. Movement must be in the same
direction as the direction of the force Push, pull, lift, etc.
3. Time is not a function of work
Energy
PowerDefined as the amount of work done over
a period of time.Force, distance, & timeDecrease the time – increase the power
Horsepower550 ft lb/s
Energy
Force Work Power Energy F=ma W=Fd P=W/t
Energy
EnergyDefined as the ability to do work
Potential energyEnergy at rest
Fig 3.6 (p. 67)Kinetic Energy
Energy in motionDefined in terms of
Work done to put the object in motionWork done on coming to rest
Energy
