Physics- Work

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  1. Equation of Work
    W=F„d = (Fcosθ)d
  2. Define Work
    Scalar
  3. Work is positive if
    the force, or a component of force, acts in the same direction as the displacement
  4. Work is negative if
    a force, or a component of force, acts in the opposite direction of displacement
  5. No work if
    force is perpendicular to displacement, or if there is no displacement
  6. cos 0
    1
  7. cos 90
    0
  8. cos 180
    -1
  9. Formula or stretching or compressing a string
    W=½kx2
  10. Formula for Kinetic Energy
    K=½mv2
  11. Formula for Potiental Energy: Spring
    Us=½kx2
  12. Formula for Potiental Energy: Gravitational
    Ug=mgy
  13. Formula of Conserved Energy
    • E0=E
    • K0+U0= K+U
  14. What conserves energy?
    Spring and Gravity
  15. What does not conserve energy? (Nonconservative)
    Friction
  16. Formula of Total Energy
    • E0+Wnc=E
    • K0+U0+Wnc=K+U
  17. Steps for solving energy problems
    • 1) Draw Diagram
    • 2) Indicate Initial and Final Position
    • 3) Indicate where gravitational poteintal energy is zero
    • 4) Use E0+Wnc=E
  18. Formula of Power
    P=Work/Time
  19. Units of Power
    • (W) Watt
    • 1 J/S = 1 W
    • I hp = 746 W
  20. Units of Work
    • J (Joule)
    • 1 N*M = I J
  21. Formula of Efficiency
    E = Wout/Ein
  22. Formula for Linear Momentum
    P=mv

Card Set Information

Author:
 andreabyerly
ID:
 43042
Filename:
 Physics- Work
Updated:
2010-10-18 16:42:42
Tags:
Physics Work
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Physics - Work
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