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# AP Physics Formulas

### AP Physics formulas and units you must memorize

Definition of average velocity v=Δd/Δt
Speed and angular velocity relationship Ï=v/r
Definition of acceleration a=Δv/Δt
Time of Free fall t=√2y/g
Acceleration and angular acceleration realtionship α=a/r
Weight W=mg
Weight on an incline (parallel) F=mg sinθ
Weight on an incline (perpendicular) F=mg cosθ
Centripetal force Fc=mv^2/r
Centripetal speed v=2πr/T
Orbital Speed v=√G(M/r)
Power P=Fv
Work-energy theorem W=ΔKE=½mvf^2-½mvi^2
Conservation of energy KEi+PEi=KEf+PEf
Conservation of energy (friction) KEi+PEi=KEf+PEf+Energy (Ff*d = energy lost from friction)
Momentum and angular momentum L=pr
Impulse (change in momentum) Δp=FΔt=mΔv
Change in angular momentum ΔL=τnetΔt=IΔω
Conservation of momentum (elastic) m1v1i+m2v2i=m1v1f+m2v2f
Totally inelastic m1v1i+m2v2i=(m1+m2)vf
Recoil (m1+m2)vi=m1v1f+m2v2f OR m1v1f=-m2v2f (if v1=0 m/s)
Conservation of angular momentum (I1)f(ω1)f+(I2)f(ω2)f=(I1)i(ω1)i+(I2)i(ω2)i
Harmonics ƒn=nv/2L n is harmonic # and L is length ƒn=nv/4L
Power relationships (electricity) P=V^2/R P=I^2R
Created by: nandrewlima.99