# Physics chapter 2 and Lab

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pmchavana's
version from
2015-09-21 03:47

## Section

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

distance | total length of travel, from beginning to end, always positive |

displacement | the change of position, xf-xi (final position minus initial position) |

positive and negative displacement | sign of displacement indicates the direction of motion (>0 is to the right, <0 is to the left) |

units- distance | meter, (m) |

average speed | distance divided by elapsed time, (av= distance/time) |

average velocity | displacement divided by time |

graphical interpretation of velocity | in an x-versus-t plot, the average velocity is the slope of a line connecting two points |

units- speed and velocity | meters per second, m/s |

instantaneous velocity | velocity at an instant of time is the limit of the average velocity over shorter and shorter time intervals |

constant velocity | the instantaneous velocity is equal to the average velocity |

graphical interpretation instantaneous velocity | x-versus-t plot, the instantaneous velocity at a given time is equal to the slope of the tangent line at that time |

average acceleration | change in velocity divided by the change in time, (vf>vi=+) (vf |

instantaneous acceleration | limit of the average acceleration as the time interval goes to zero |

constant acceleration | instantaneous acceleration is equal to the average acceleration |

deceleration | object whose speed is decreasing, when velocity and acceleration have opposite signs |

graphical interpretation acceleration | v-versus-t plot, the instantaneous acceleration is equal to the slope of the tangent line at a given time |

units-acceleration | meters per second per second, m/s*2 |

velocity as a function of time | v=v0+at |

initial,final, and average velocity | vav=1/2(v0+v) |

position as a function of time and velocity | x=x0+1/2(v0+v)*t |

position as a function of time and acceleration | x-x0+v0t+1/2at*2 |

velocity as a function of position | v*2=v0*2+2a(x-x0)=v0*2+2a_x (_ is displacment) |

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