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# 12C Motion Terms

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

Define kinematics | Study of motion. Describes how objects move (but not why they move) |

What is a scalar quantity? | Quantity that has a number and unit. E.g., 10 m |

What is a vector? | Quantity that has a number,a unit and a direction. E.g., 24 m/s [W] |

Define position | Distance and direction of an object from a reference position. Vector. |

Define displacement | Change in position of an object. Vector quantity. |

Formula for displacement? | Final position minus initial position. |

Define speed | Ratio of distance travelled to the total time time of travel. Scalar. |

Formula for speed | Distance travelled divided by the time. |

Define velocity | Ratio of displacement to the time interval for displacement. Vector. |

Formula for velocity | Displacement divided by the time. |

Define accelerated motion | Motion with changing velocity (changing speed, changing direction, or both changing speed & direction). |

Define constant acceleration | Straight line motion in which velocity changes by same amount each second |

Formula for acceleration | Change in velocity (final velocity minus initial velocity) divided by time. Vector. |

State value of acceleration due to gravity | 9.8 m/s^2 [down] |

What does it mean for an object to be in free fall? | When air resistance on a falling object is ignored. When objects fall with acceleration due to gravity. |

Created by:
mskimteacher