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Summary Work, Energy and Power

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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

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  • November 11, 2021
  • 3
  • 2021/2022
  • Summary
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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

W Foxcos0

FioridoneFTeforceontiffectEnergyistransferredtotheobject ieenergyoftheobtectincrease
1 Wilen

2 If 0 180 W Fox

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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