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# Motion (chpt 8-9)

### Chapter terms

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

Acceleration | The rate at which an object changes its velocity |

Air Resistance | A friction-like force that opposes the motion of objects that move through the air |

Average Acceleration | Average rate at which an object changes its velocity |

Average Velocity | The rate of change in position for a time interval |

Line of Best Fit | A straight line that most closely fits the general shape outlined by the graph |

Change in Velocity | Change that occurs when the speed of an object changes, or its direction of motion changes, or both (Vf- Vi) |

Deceleration | The acceleration that is opposite to the direction of motion; a decrease in speed of an object |

Displacement | The straight-line distance and direction from one point to another |

Distance (d) | A scalar quantity that describes the length of a path between two points or locations |

Gravity | Attractive forces between two or masses; causes objects to be pulled towards the center of earth |

Motion Diagram | A diagram that gives a picture of motion by showing an object's position at given times |

Position | A vector quantity that describes a specific point relative to a reference point |

Position-Time Graph | A graph of an objects position during corresponding time intervals; (time = x-axis, position = y-axis) |

Scalars | Quantities that have only a magnitude (no direction) |

Slope | A direction of a line on a graph, either horizontal (zero), slanting up ( positive), or slanting down (negative) Formula= rise/run |

Speed (v) | A distance of an object travels given a certain time interval divided by the time interval |

Time (t) | When an event occurs |

Time Interval | The difference between the final time and the initial time |

Uniform Motion | Traveling in equal displacements in equal time intervals |

Vectors | Quantities that have both a magnitude and a direction |

Velocity | The displacement of an object during a time interval divided by the time interval |

Velocity-Time Graph | A graph of an object's velocity during corresponding time intervals (time= x-axis, velocity= y-axis) |

Magnitude | Refers to the size of a measurement or the amount (number) you are counting |