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# '17 1D motion review

### Review of 1D motion and intro to forces

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

Distance divided by time | speed |

Change in position relative to the frame of reference | motion |

Starting point used to measure motion (system for specifying an objects location) | Frame of Reference |

Quantity that has magnitude only | Scalar Quantity |

Quantity that has both magnitude and direction | Vector Quantity |

Change in velocity divided by time | Acceleration |

Velocity if returning back to starting position | 0 m/s |

acts on an object to change its motion or state of rest | force |

Shortest distance between 2 points during motion | Displacement |

Displacement divided by time | Velocity |

the complete/total path of motion made by an object | distance |

2 ways to have zero acceleration | at rest or constant velocity |

ways to accelerate | speed up, slow down, change direction |

2 ways to have positive acceleration | speed up in (+) direction , slow down in (-) direction |

2 ways to have negative acceleration | slow down in (+) direction , speed up in (-) direction |

slope on a position vs. time graph | speed |

on a position vs. time graph, this shows object is moving in positive direction | positive slope |

on a position vs. time graph, this show object is at rest | line is straight (zero slope) |

on a position vs. time graph, this shows object is moving in negative direction | negative slope |

use this to find the magnitude of displacement of 90 degree motion (right angle) | Pythagorean Theorem |

on a velocity vs. time graph, this shows object is speeding up | line goes away from x-axis |

force that always opposes motion | friction |

slope on a velocity vs. time graph | acceleration |

on a velocity vs. time graph, this shows object is moving in positive direction | line is in "top" quadrant |

on a velocity vs. time graph, this shows object is moving in negative direction | line is in "bottom" quadrant |

on a velocity vs. time graph, this shows object is slowing down | line goes toward x- axis |

on a velocity vs. time graph, this shows object has constant velocity | line is straight (zero slope) at a non-zero value |

on a velocity vs. time graph, this shows object is at rest | line is straight (zero slope) at zero only |

object traveling in a circle has this acceleration | centripetal |

frictional force that acts on moving objects | kinetic |

frictional force that acts on stationary objects | static |

this is used to find the degrees of direction of 90 degree motion (right angle) | tan^-1 (atan) |

Created by:
cadetjt