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# 1st midquarter test

### Physics

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

units used for force | Newtons [n] |

units used for pressure | newtons/centimeters2 [n/cm2] |

units used for area | centimeters2 [cm2] |

units used for distance | meters [m] |

units used for speed | meters/second [m/s] |

units used for reaction time | seconds [s] |

units used for velocity | meters/second [m/s] |

units used for length | meters [m] |

units used for width | meters [m] |

how are mass and weight different | mass is a measurement of matter and weight is a measurement of how gravity affects mass |

define force | a push or a pull |

whats the formula for pressure | p=f/a |

as a mass increases an objects inertia ... | increases |

define inertia | an objects resistance to a change in state of motion |

why is newtons first law also called "the law of inertia" | because newtons first law is based on the property of inertia |

what is newtons 1st law | an object in motion stays in motion, an object at rest stays at rest unless acted on by an outside force |

define constant speed | a speed that doesnt change |

define instantaneous speed | a speed at a particular instant in time |

define average speed | total distance divided by total time |

can average speed and instantaneous speed be the same? when? | yes when traveling at a constant speed |

what is the distance between speed and velocity | velocity includes direction and speed does not |

-whats the speed formula -re-write it, solved for time - re-write it, solved for distance | -s=d/t -t=d/s -d=t*s |

as a driver increases his/her speed the minimum safe following distance ... ( increases or decreases) | increases |

how does talking on a cell phone affect a drivers reaction time (increases it or decreases it) | increases it |

what is the minimum safe following distance measuring | the distance traveled before a person reacts |

when measuring a reaction time, what two events are we measuring the time between | when an event occurs and when a person reacts |