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# Physics Equations

### Physics Equations for IGCSE 9-1 2019

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

Equation with speed, time and distance ? | Average speed= Distance moved/ Time taken |

Equation with velocity, acceleration, and time | Acceleration= Change in velocity / Time taken |

Equation with Force, mass and acceleration | Force= Mass x Acceleration |

Equation with weight, gravitational field strength and mass | Weight= Mass x Gravitational field strength |

Equation with perpendicular distance from the pivot, moments and force | Moment= Force x Perpendicular distance from the pivot |

Equation with power, current and voltage | Power= Current x Voltage |

Equation with Voltage, Resistance and Current | Voltage= Current x Resistance |

Equation with Charge, Current and Time | Charge= Current x Time |

Equation with wavelength, wave speed and frequency | Wave speed= Frequency x Wavelength |

Equation for Refractive index | Refractive index =sin i/ sin r |

Equation with useful energy output, total energy input and efficiency | Efficiency = useful energy output / total energy input |

Equation with work done, force and distance moved | Work Done = Force x Distance moved |

Equation with GPE, mass, height and g | Gravitational Potential Energy = mass x g x height |

Equation for Kinetic Energy | Kinetic energy = 1/2 x mass x speedĀ² (speed is squared) |

Equation with energy transferred and work done | Energy Transferred = Work done |

Equation with volume, density and mass | Density = Mass / Volume |

Equation with pressure, area and force | Pressure= Force / Area |

Equation with pressure difference, height, density and g | Pressure Difference = Height x Density x g |

Equation with input voltage, output voltage and primary and secondary turns | Input (primary) Voltage/ Output (secondary) Voltage = Primary turns/ Secondary turns |

Equation with input and output power | Input Power = Output Power (for 100% efficiency) |

Equation with Momentum, Velocity and Mass | Momentum= Mass x Velocity |

Equation with Momentum, Force Acting and Time Taken | Force Acting= Change in Momentum/ Time Taken |