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Chapters 7 & 8
Work Power etc.
9
Physics
Undergraduate 1
10/06/2008
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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)MV2

  • Scalar no direction
  • Unit is Joule
  • + only
Term
Potential Energy
 Definition

U=Mgh

  • Unit is Joule
  • Not 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+ωconservative
ωcon=-ΔU
Δk=ωNC- ΔU
kο +Uο+ωN=kf+Uf
left side is Total initial mechanical energy Eο
Right side is total final mechanical energy Ef
Use the work energy equation any time you have a combination of... change in height, speed or work
Term
Kinematics
 Definition
  1. Vf=Vο+at
  2. Vf2=Vο2+2aΔr
  3. rf=rο+vοt+1/2at2
Term
Projectile Equations
 Definition

Vfy=Voy-gt

V2fy=V2oy-2gΔy

yf=yo+Voyt-(1/2)gt2

xf=xo+Voxt (range equation)

Term
Power
 Definition

P=ω/Δt

Units are watts

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