# Equilibrium, Torque, and Energy

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1. static equilibrium
zero velocity
2. dynamic equilibrium
velocity is not zero
3. Is equilibrium motionless?
NO!

just, some of all forces acting on the system = 0
4. 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
5. Example: Fdown due to gravity
Fup due to air resistance
Fdown > Fup, so

Fdown = Fup + ma
6. What does this mean?
In order to be in equilibrium Fup must be increased by ma
7. Torque (equation)
t = F x r x sin
8. Torque (equilibrium)
0 net torque
Tclockwise = Tcounter-clockwise
9. static equilibrium
Fup = Fdown
10. If force is at the point of rotation, what is the torque?
0
11. board hanging on a string, in equilibrium
• F = mass of the board
• at the center of mass
12. Units of energy
• (J) for macroscopic sys
• (eV) microscopic sys
13. forms of mechanical energy
• kinetic energy
• potential energy
14. What is kinetic energy?
What is the equation for kinetic energy?
energy of motion

1/2 mv2

### Card Set Information

 Author: natalieplana ID: 68782 Filename: Equilibrium, Torque, and Energy Updated: 2011-02-25 01:55:37 Tags: PH3 Folders: Description: Physics Lecture 3 Show Answers:

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