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# Unit 2 Vocab

### Important vocabulary to know from Unit 2.

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

Best-fit line | an average of all the data points on a graph; a way to fit a data set to a linear pattern |

Scientific model | any method of representing the relationship between two variables |

Graphical model | a representation that shows how two variables are related on a graph so that the relationship is easily seen and understood |

Physical model | this is something that is made of materials that can be touched and measured that can be used to show how variable relate to each other i.e. a scale model |

Conceptual model | a written description or diagram based on ideas and observations that is used to describe how a process or object works; i.e. a blueprint or a statement of how two variables are related |

Average speed | how fast an object moves over a certain distance, on average |

Instantaneous speed | how fast an object is moving at a specific point in its journey |

Slope of a position-time graph | This represents the velocity of an object |

Slope of a velocity-time graph | This represents the acceleration of an object |

velocity | speed with direction; how much distance (and in which direction) an object covers in one unit of time |

acceleration | how much the velocity of an object changes in one unit of time (and the direction this happens in) |

reference point | point in space that is the "0" position; all other positions are measured relative to it |

coordinate axis | a fixed reference line with directions indicated; the object moves along this line |

deceleration | the term used for when an object is slowing down |

problem solving steps | 1. Looking for 2. Givens 3. Equation 4. Solution |

constant velocity | velocity that does not change i.e. movement at a constant rate, not slowing down or speeding up |