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# AP Physics Formulas

### AP Physics formulas and units you must memorize

Question | Answer |
---|---|

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 |