# Shared Flashcard Set

## Details

Chapters 7 & 8
Work Power etc.
9
Physics
10/06/2008

Term
 Work
Definition
 W=Fll Δrll  For a constant force Work is scalar (no direction)Work can be + or -Work is + when the F component is in the direction of motion and negative when it is against motion. Unit for work is Joule
Term
 Kinetic Energy
Definition
 K= (1/2)MV2Scalar no directionUnit is Joule+ only
Term
 Potential Energy
Definition
 U=MghUnit is JouleNot a vector may be + or-set a reference level for height, usually the lowest relevent point in the problem h≡0 at that point
Term
 Work Energy Conservation
Definition
 ωtotal=Δk (change in kinetic energy)ωtotal=ωnon-conservative+ωconservativeωcon=-ΔUΔk=ωNC- ΔUkο +Uο+ωN=kf+Ufleft side is Total initial mechanical energy EοRight side is total final mechanical energy EfUse the work energy equation any time you have a combination of... change in height, speed or work
Term
 Kinematics
Definition
 Vf=Vο+atVf2=Vο2+2aΔrrf=rο+vοt+1/2at2
Term
 Projectile Equations
Definition
 Vfy=Voy-gtV2fy=V2oy-2gΔyyf=yo+Voyt-(1/2)gt2 xf=xo+Voxt (range equation)
Term
 Power
Definition
 P=ω/ΔtUnits are watts
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