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# Physics chapter 1

### force and momentum

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

equation for momentum (vector - has direction) | momentum(p) = mass(kg) x velocity(m.s-1) (in Ns) |

Newtons 1st law | remain at rest or uniform motion unless acted on by a force |

Newtons 2nd law | rate of change of momentum of an object is proportional to the resultant force on it |

equation for change in momentum/impulse | Force(N) x time(s) = mv(final) - mu(initial) |

Areas under a force/time graph | impulse (Ns) |

elastic collision | no loss of kinetic energy, or momentum |

inelastic collision | kinetic energy is transferred to energy in other forms, momentum conserved |

Impluse (Ns) | magnitude of a force multiplied by the time it takes to act |

vector | magnitude and direction |

scalar | only magnitude |

gradient of displacement/time graph | velocity (rate of change of displacement) |

gradient of velocity/time graph | acceleration (rate of change of velocity) |

resultant force equation | F(N) = mass(kg) x acceleration(m.s-2) |

equation for work done | Work = Force(N) x distance(m) (in Nm) |

power | rate of change of energy |

equation for kinetic energy | 1/2 x mass x velocity ^2 (in J) |

equation for potential energy | mass(kg) x g x change in h (in J) |

Newtons 3rd Law | when objects interact they exert equal and opposite forces on each other |

Principle of Conservation of Momentum | for a system, the total momentum remains constant, provided no external forces |

How do you work out a Force at an angle to the direction of the force? | when in a parallel component = Fcosθ when in perpendicular component = Fsinθ |