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# Kinematics

### Kinematics Vocab

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

Mechanics | the study of the motion of objects |

Kinematics | the language of mechanics |

Linear motion | when an object moves in a straight line |

Circular motion (parabolic) | when an object moves along a curved path |

Vibrational motion | when an object simply vibrates |

Rotational motion | when an object rotates around a fixed position (toy top) |

Speed | how fast an object is moving |

Scalar quantity | fully described by a value |

Vector quantity | described by a value and a direction |

Velocity | rate at which an object changes its position |

Distance to time ratio | speed of the object |

Acceleration | rate an object's velocity changes |

Rate quantity | time-based |

Distance | "how much ground an object covered" during its motion |

Displacement | "how far out of place an object is"; overall change |

Instantaneous speed | speed at any given instant in time (speedometer) |

Average speed | average of all instantaneous speeds |

Constant acceleration | when velocity changes by a constant amount each value |

Positive acceleration | when an object is speeding up in the positive direction/ when an object is slowing down in the negative direction |

Negative acceleration | when an object is slowing down in the positive direction/ when an object is speeding up in the negative direction |

Vector diagrams | diagrams that depict the direction and relative magnitude of a vector quantity by a vector arrow |

Ticker tape analysis | when a long tape is attached to an object in motion and threaded through a device that places a tick at regular intervals |