Physics 111:
Important Formulas Test 2
- Work and Energy
Work = F x cos
Power = Work/time = F v cos
KE = ½mv2
PEgrav = mgh
Work = 
(KE) and/or
(PE)
Conservation of energy: Ei = Ef
- Momentum
p = mv
F
t = m
v =
p
Impulse = F
t
2nd law: 
Conservation of momentum (collisions): pi = pf
- Density
D = m/V
Weight density = mg/V
Relative density, R = D/Dwater
- Pressure
p = (Normal Force)/A = F/A
Pressure at a depth = Dhg
Pabs = Patm + pgauge
Archimedes Principle: Buoyancy force = Weight of fluid displaced
FB = mg = DVg
Buoyancy force and weight are often in equilibrium
- Simple Harmonic Motion (SHM)
Hooke's law, F = -kx
PEelastic = ½kx2
Period, 
Max(PE) = Max(KE); ½kA2 = ½mv2
A - amplitude
Simple pendulum, 