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# Physics Glossary 1

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

accuray | the degree to which a measured value agrees with the correct value for that measurement |

approximation | an estimated value based on prior experience and reasoning |

classical physics | physics that was developed from the renaissance to the end of the 19th century |

conversion factor | a ratio expressing how many of one unit are equal to another unit |

derived units | units that can be calculated using algebraic combinations of the funamental units |

English units | system of measurement used in the United States; inculdes units of measurement such as feet, gallons and pounds |

fundamental units | units that can only be expressed relative to the procedure used to measure them |

kilogram | the SI unit of ass, abbreviated (kg) |

law | a description, using concise language or a mathematical formula, a generalized pattern in nature that is supported by scientific evidence and repeated experiments |

meter | the SI unit of legth, abbreviated (m) |

method of adding percents | the percent uncertainty in a quantity calculated by muliplication or division is the sum of the percent uncertainties in the itmes used to make calculation |

metric system | a system in which values can be calculated in factors of 10 |

model | representation of something that is often to difficult (or impossible) to display directly |

modern physics | the study of relativity, quantum mechanics or both |

order of magnitude | refers to the size of a quantity as it relatesto a power of 10 |

percent uncertainty | the ration of the uncertainty of a measurement to the measured value, epressed as a percentage |

physical quantity | a characteristic or property of an object that can be measured or calculated from other measurements |

physics | the science concerned with describing the interactions of energy, matter, space and time; it is especially interested in what fundamental mechanisms underlie every phenomenon |

precision | the degee to which repeated measurements agree with each other |

quantum mechanics | the study of objects smaller than can be seen with a microscope |

relativity | the study of objects moving at speeds greater that about 1% of speed of light, or of objects being affected by a strong gravitational field |

scientific method 1 | a method that typically begins with an observation and question that the scientist will research; next, the scientist typically performs some research about the topic and then devises a hypothesis; |

scientific method 2 | then , the scientist will test the hypothesis by performing an experiment, finally, the scientist analyzes the results of the experiment and draws a conclusion |

second | the SI unit for time, abbreviated (s) |

SI units | the international system of units that scientists in most countries have agreed to use: includes units such as meters, liters and grams |

significant figures | express the precision of a measuring tool used to measure a value |

theory | an explanation for paterns in nature that is supported by scientific evidence and verified multiple times by various groups of reseachers |

uncertainty | a quantitative measure of how much you measured values deviate from the standard or expected value |

units | a standard used for expressing and comparing measurements |

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