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Physics- Work
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Equation of Work
W=F„d = (Fcosθ)d
Define Work
Scalar
Work is positive if
the force, or a component of force, acts in the same direction as the displacement
Work is negative if
a force, or a component of force, acts in the opposite direction of displacement
No work if
force is perpendicular to displacement, or if there is no displacement
cos 0
1
cos 90
0
cos 180
-1
Formula or stretching or compressing a string
W=½kx
^{2}
Formula for Kinetic Energy
K=½mv
^{2}
Formula for Potiental Energy: Spring
U
_{s}
=½kx
^{2}
Formula for Potiental Energy: Gravitational
U
_{g}
=mgy
Formula of Conserved Energy
E
_{0}
=E
K
_{0}
+U
_{0}
= K+U
What conserves energy?
Spring and Gravity
What does not conserve energy? (Nonconservative)
Friction
Formula of Total Energy
E
_{0}
+W
_{nc}
=E
K
_{0}
+U
_{0}
+W
_{nc}
=K+U
Steps for solving energy problems
1) Draw Diagram
2) Indicate Initial and Final Position
3) Indicate where gravitational poteintal energy is zero
4) Use E
_{0}
+W
_{nc}
=E
Formula of Power
P=Work/Time
Units of Power
(W) Watt
1 J/S = 1 W
I hp = 746 W
Units of Work
J (Joule)
1 N*M = I J
Formula of Efficiency
E = W
_{out}
/E
_{in}
Formula for Linear Momentum
P=mv
Author
andreabyerly
ID
43042
Card Set
Physics- Work
Description
Physics - Work
Updated
2010-10-18T16:42:42Z
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