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# zachry 9252012 quiz

### quiz 9252012 for science 8

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

observation | using your 5 senses to describe an object (thing) or event (something that happens) |

Qualitative | An observation that tells what an object is like-shape, color, texture, smell |

Quantitative | An Observation that includes a number or could be measured and have a number |

Variable | Something that can be changed in an experiment or a math problem |

Independent Variable | The variable that the scientist changes on purpose in order to find out what will happen |

Dependent variable | the variable that a scientist measures and checks at the end of the experiment |

one | the number of variables that are changed during an experiment |

meter | the base unit in the metric system for measuring distance |

liter | the base unit in the metric system for measuring volume |

gram | the base unit in the metric system for measuring mass |

milli | means 1/1000 a milligram is about the size of a grain of sand milli's are very small! |

Kilo | means 1000 a kilogram is about 2.2 pounds and a kilometer is a bit more than 1/2 a mile, a kiloliter is 500 2 liter bottles! |

centi | 1/100 there are 100 centimeters in a meter |

sample size | is the number of trials or subjects in an experiment. Generally the larger the sample size the more reliable the information. |

Speed | speed= distance divided by time |

motion | the change of location of an object compared to a reference point |

distance | the actual length of the route that an object has traveled |

displacement | the distnce between your starting and ending point and the direction you traveled. This is the shortest possible distance between start and finish (as the crow flies)and the direction you travel |

average speed | speed calculated over a period of time |

instantaneous speed | speed at an instant of time (usually a second or less) |

velocity | is the speed of an object and the direction it is traveling in-change in speed or direction changes velocity! |

interval | a period of time |

accuracy | making good and exact measurements |

acceleration | a change in velocity (direction or speed) of an object divided by the time it takes for the change to occur |

Created by:
zachryca