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# Physics Equations

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

Speed | Speed = Distance ÷ Time |

Force | Force = Mass × Acceleration |

Velocity | Velocity = Displacement ÷ Time |

Acceleration | Acceleration = (Final Velocity - Initial Velocity) ÷ Time taken |

Weight | Weight = Mass × Gravitational Field Strength |

Momentum | Momentum = Mass × Velocity |

Force (momentum) | Force = Mass × ((Final velocity - Initial Velocity) ÷ Time) AKA Force = Change in Momentum ÷ Time |

Kinetic Energy | Kinetic Energy = 1/2 × Mass × Velocity^2 |

9 Energy Types | Sound, GPE, Kinetic, Light, Heat/Thermal, Electrical, Nuclear, Elastic, Chemical |

Efficiency | Efficiency = Useful Energy Out ÷ Total Energy in |

Change in GPE | Change in GPE = Mass × Gravitational Field Strength × Change in Vertical Height |

Wavelength | The distance between two wave peaks |

Amplitude | The height of a peak |

Wavespeed | Wavespeed = Frequency × Wavelength |

Human frequency hearing range | 20Hz - 20kHz |

Distance | Distance = Time × Speed |

Work | Work = Force × Distance |

Power | Power = Work Done ÷ Time |

Stopping Distance | Stopping Distance = Thinking Distance + Braking Distance |

Moment | Moment = Force × Distance Moved Perpendicular to the direction of force from the pivot |

Power (Time) | Power = Energy Transferred ÷ Time take |

Charge | Charge = Current × Time |

Energy Transferred | Energy Transferred = Charge × Potential Difference |

Potential Difference | Potential Difference = Current × Resistance |

Mains Voltage | 230V |

Power (Resistance) |