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# Physics gcse

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

Speed m/s | Distance m ————— Time s |

Acceleration m/s^2 | Change in velocity m/s —————————— Time s |

Force N | Mass kg X acceleration m/s^2 |

Weight N | Mass kg X gravitational field strength N/kg |

Momentum kgm/s | Mass kg X velocity m/s |

Change in gravitational potential energy J | Mass kg X gravitational field strength N/kg X height m |

Kinetic energy J | 1/2 X mass kg X velocity^2 (m/s)^2 |

Efficiency | Useful energy J ——————— (X100 for %) Total energy J |

Wave speed m/s | Frequency Hz X wavelength m OR Distance m ————— Time s |

Power W | Work done J Energy transferred —————— OR ————————— Time Time |

Moment of a force Nm | Force N X distance normal to the direction of the force m |

Energy transferred J | Charge moved c X potential difference v |

Charge c | Current A X time s |

Potential difference v | Current A X resistance ohmes |

Electrical power w | Current A X potential difference v OR Current^2 A^2 X resistance ohmes |

Density kg/m^3 | Mass kg ———— Volume m^3 |

Force exerted on a spring N | Spring constant N/m X extension m |

Pressure Pa | Force normal to surfacr N ———————————— Area of surface m^2 |