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# Constant Motion

### Linear 1D Motion

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

Motion | An object's change in position over some time interval |

Constant Motion | An object's position changes by a consistent amount each time interval |

Examples of Constant Motion | At rest, moving at 30 m/s |

Pictorial representation of constant motion | . . . . . . . . . . . . . . |

Changing Motion (acceleration) | An object's position changes by different amounts each time interval |

Examples of Changing Motion | Speeding up, Slowing down |

Pictorial representation of changing motion | . . . . . . |

Relative Motion | Motion depends on the perspective of the observer |

Description of constant motion position vs time graph | can be a flat straight line or a straight diagonal line |

Description of changing motion position vs time graph | can be a curved line getting steeper or less steep |

Description of constant motion velocity vs time graph | must be a flat straight line; slope of 0 |

Description of changing motion velocity vs time graph | can be a diagonal line |

What is the significance of the slope of a position time graph? | It gives the speed of an object |

What is a scalar quantity? | magnitude only (number only) |

What is a vector quantity? | magnitude and direction ( number with a direction) |

Examples of scalars | speed, distance |

Examples of vectors | velocity, displacement, acceleration |

A steeper slope means what on a position vs time graph? | moving faster |

A less steep slope on a position vs time graph means? | moving slower |

The equation for speed is_______. | distance/ time |

The equation for slope is _______. | rise / run |

A boy walks 4 m North and then 4 m South. What distance did he travel? | 8 m |

A boy walks 4 m North and then 4 m South. What is his displacement? | 0m |

A girl runs 15m from her home in 30 seconds, then realizes she left her project and runs back in 30 seconds. What is her speed? | 0.5 m/s |

A girl runs 15m from her home in 30 seconds, then realizes she left her project and runs back in 30 seconds. What is her velocity? | 0 m/s |

What is the equation for velocity? | displacement / time |

A boat is traveling at 5 m/s north while the river is flowing south at 2 m/s. According to an observer on the shore the boat is traveling at velocity? | 3 m/s north |