summary and important definitions for work, work-energy theorem, conservation of energy with non-conservative forces present and power as well as important notes and equations
WORKENERGY POWER
Energy TheabilityTodowork
Networkdoneinasystem Totalworkdone bytheappliedforce
PositivenetworkdoneonthesystemThe forceHasacomponentinthesamedirectionasthedisplacementoftheobject
NegativenetworkdoneonthesystemtheforceHasacomponentinthedirectionoppositetothedisplacement
Isolatedsystem netexternalforce excgravforce actingonthesystemis zero
Workdoneonanobjectbyaconstantforce F
magnitude
of displacement
p
t DX COSD anglebetweenforce
and displacement
magnitude
oftheforce d
Workdoneby aforceis to theproduct of thecomponentoftheforceactingin thedirectionofthe
displacement
eg workdoneagainstfrictionmustbeavoided
If
Whenworkisdone byforceonTiteobjectenergyistransferredfrom it to it's surrounding
ie theenergyobjectdecrease
3 IF 0 90
OF Wo
g
Theforcedoesnoworkontheobject
i e theenergywillremainthesameMeaningnoenergyistransferred to orfromtheobject
DIFFERENTTYPES OF ENERGY
PotentialEnergy Theenergywitiat anobjectpossessdueto itsposition
GravitationalPotentialEnergyThe doworkina rotationalfield
abettingbugtight
449.8 surface
Heightabove the
of theearth
KineticEnergy energyanobjectpossessesbecauseof its motion Formula K Yamu
MechanicalEnergyThesumof anobjectskineticandpotentialenergy Em ExtEp
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