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Equilibrium, Torque, and Energy
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static equilibrium
zero velocity
dynamic equilibrium
velocity is not zero
Is equilibrium motionless?
NO!
just, some of all forces acting on the system = 0
straight acceleration (not in equilibrium)
What is the equation?
∑F = ma
1. write equation as if sys. were in equilibrium
2. add "ma" to side with
less
force
Example: F
_{down}
due to gravity
F
_{up}
due to air resistance
F
_{down}
> F
_{up}
, so
F
_{down}
= F
_{up}
+ ma
What does this mean?
In order to be in equilibrium F
_{up}
must be increased by ma
Torque (equation)
t
= F x r x sin
Torque (equilibrium)
0 net torque
T
_{clockwise}
= T
_{counter-clockwise}
static equilibrium
F
_{up}
= F
down
If force is at the point of rotation, what is the torque?
0
board hanging on a string, in equilibrium
F = mass of the board
at the center of mass
Units of energy
(J) for macroscopic sys
(eV) microscopic sys
forms of mechanical energy
kinetic energy
potential energy
What is kinetic energy?
What is the equation for kinetic energy?
energy of motion
1/2 mv
^{2}
Author
natalieplana
ID
68782
Card Set
Equilibrium, Torque, and Energy
Description
Physics Lecture 3
Updated
2011-02-25T01:55:37Z
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