Equilibrium, Torque, and Energy
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velocity is not zero
Is equilibrium motionless?
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: Fdown due to gravity
Fup due to air resistance
Fdown > Fup, so
Fdown = Fup + ma
What does this mean?
In order to be in equilibrium Fup must be increased by ma
t = F x r x sin
0 net torque
Tclockwise = Tcounter-clockwise
Fup = Fdown
If force is at the point of rotation, what is the torque?
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
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