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# MCAT Physics JBrosch

Term | Definition |
---|---|

Ohm's Law | V= IR |

Current | I= Q/t (movement of positive charge; created by voltage) |

Power in a circuit = ? | I^2R = IV = (V^2)/R = Work/time |

Work for charges? | - change in V * q |

Voltage? | Change in Potential; creates current |

Potential Voltage? | kq/r |

Work/ Energy? | W = change in KE = NEGATIVE change in PE (Joules) |

Electric Force? | kqQ/(r^2) OR qE (just add extra q to numerator) |

Electric Field? | kq/(r^2) OR F/q (divide force by q to cancel out extra q in numerator) |

Work of Electric Field? | Fd = qEd |

Resistance | rho (L/A) |

Capacitance | permittivity of free space (A/d) |

Potential across the capacitor | U = (q^2)/2C |

Electric field inside conductor | Zero |

Coulomb | 9 x 10^9 (Nm^2)/(C^2) |

2 pi rads | 360 degrees |

1 rad | 57.3 degrees |

An induced current... | OPPOSES the magnetic field |

Centripetal acceleration | (v^2)/r = omega^2*r |

Parallel acceleration (rotational) | alpha * r |

Escape velocity | (2gr)^(1/2) |

Work (rotational) | torque * theta |

Force (rotational) | torque/ r |

Torque | F*r*sin(theta) OR F*"lever arm" |

Inertia | resistance to movement |

momentum | mass*velocity |

change in momentum | impulse = F*(change in time) |

KE | mv^2/2 |

PE (spring); Hooke's Law | kx^2/2 |

Force of spring | -kx |

frequency | 1/T |

T pendulum | 2pi(L/g)^1/2 |

T spring | 2pi(m/k)^1/2 |

Stress | force/ area |

Strain | change in length/ length |

F buoyant | V fluid * density fluid* g |

Doppler | F apparent = original V sound/ (V sound - V source) |

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