# 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
 Author: andreabyerly ID: 43042 Card Set: Physics- Work Updated: 2010-10-18 16:42:42 Tags: Physics Work Folders: Description: Physics - Work Show Answers: