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# Motion1

### Motion, speed, velocity, acceleration

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

Change in position relative to a reference point. | motion |

A stationary object used for comparison to determine if an object is in motion. | reference point |

SI unit of length | meter |

Number of centimeters in one meter | 100 |

Number of meters in one kilometer | 1000 |

The distance traveled in a certain amount of time | speed |

Total distance divided by total time | average speed |

Speed in a given direction | velocity |

Rise divided by run | slope |

The rate at which velocity changes | acceleration |

Increasing speed, decreasing speed,or changing direction | acceleration |

For an object moving in a straight line, the change in speed per unit of time | acceleration |

Both velocity and acceleration include ______________ of an object's motion | direction |

For zero distance, speed is | zero |

For zero speed, motion is | zero |

For zero acceleration, speed does not | change |

The steepness of a line on a graph | slope |

When an object's distance from another object is changing it it in | motion |

Speed equals distance divided by | time |

When you know both the speed and direction of an object's motion you know the | velocity |

If the speed of an object does NOT change the object is traveling at a | constant speed |

If an object moves in the same direction and at a constant speed _____ did not change. | velocity |

Example of deceleration is a car approaching a | red light |

Riding a ferris wheel is acceleration because ___________ is changing | direction |

SI unit of speed | m/s |

SI unit of acceleration | meter per second per second |