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# Physics Formulas

### all formulas that yo need to knaw for the exam that are not in the exam paper.

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

Avarage Speed | Distance Moved / Time taken |

Force | Mass x Accelration |

Acceleration | Change in Velocity / Time |

Density | Mass / Volume |

Work Done | Force x Distance Moved |

Energy Transfered | Work Done |

Kenetic Energy | 0.5 x Mass x Velocity^2 |

Gravitational Potential Energy | Mass x 9.8 x Height |

Weight | Mass x 9.8 |

Pressure | Force / Area |

Momment | Force x Perpendicular Distance From The Pivot |

Charge | Current x Time |

Voltage | Current x Resistance |

Electrical Power | Voltage x Current |

Wave Speed | Wave Length x Frequency |

Efficiency | (Useful Output/Useful Input) x 100% |

Pressure Difference | Height x Density x Gravitational Potential Energy |

Refractive Index (Refraction) | sin c =1 / n |

Refractive index (Incidence) | n = Sin I (Incidence)/ Sin R (Refraction) |