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# L1 Mechanics

### Definitions for mechanics AS90940

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

Distance | A measure of how far an object has travelled or the amount of space between two objects. |

Time | A measure of how long an object has been travelling for. |

Speed | A measure of how far an object has travelled in a certain amount of time. |

Velocity | The speed of an object in a given direction. |

Acceleration | The rate of change of velocity or speed per unit of time. |

Deceleration | The rate of decreasing velocity or speed per unit of time. |

Distance-time graph | A graph used to show the distance an object has travelled over a period of time. Used to determine the speed of an object. |

Speed-time graph | A graph used to show the speed an object has travelled over a period of time. Used to determine the distance an object has travelled. |

Force | A push, pull or a twist. |

Balanced Force | Occurs when the total of all forces on an object equal zero and the object's motion does not change. |

Unbalanced Force | Unbalanced forces cause a change in motion in an object because the forces acting on the object are not equal. |

Newton | The SI unit for forces. |

Thrust | To push an object in a particular direction. |

Mass | The amount of matter inside an object. |

Weight | The effect of gravity on an object's mass. |

Friction | The resistance that one surface or object encounters when moving over another. It is a force that always opposes the movement of an object. |

The resistance that one surface or object encounters when moving over another. It is a force that always opposes the movement of an object. | A force that opposes motion of an object through a fluid [liquid or gas]. |

Pressure | Force per unit area. |

Pascal [Pa] | The SI unit of pressure, equal to one newton per square metre. |

Energy | Energy is the ability to do work. |

Joule | The SI unit of work or energy. |

Gravitational Potential Energy | The energy stored in an object due to its height above Earth. |

Kinetic Energy | The energy of an object due to its motion. |

Work | When force moves an object, resulting in the transfer of energy to that object. Calculated using the formula W=Fxd. Measured in Joules. |

Power | Is the rate of doing work, or the rate of transfer of energy to that object. It is calculated using the formula P=W/t. Measured in Watts. |

Watt | The SI unit of power. |