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# AP Physics 1

### Vocabulary Chapter 1

Term | Definition |
---|---|

Diameter | A chord that passes through the center of a circle; the length of a straight line segment that begins on a circle, passes through the center, and ends on the circle. > The length of a diameter is twice the length of a radius of the circle. |

Kilogram (kg) | The SI unit of mass equal to 1,000 grams. |

Mass | The resistance that an object offers to a force acting upon it; the ratio of the net force acting on the object to its acceleration: m=F/a. >The SI unit of mass is the kilogram(kg). |

Meter(m) | The SI unit of length. It is a fundamental unit. |

Order of Magnitude | A rough measure of size relationships, usually expressed as powers of 10. > For example, a quantity may be approximately ten times (1 order of magnitude), or a hundred times (2 orders of magnitude), or a thousand times (3 orders of magnitude) |

Second | The SI unit of time. It is a fundamental unit. |

Circumference | The perimeter or "distance" around a circle. Mathematically determined as the product of π and the diameter, or the product of π and twice the radius: C= πd = 2πr. |

Slope of a Graph | The ratio of the change in the vertical coordinate to the change in the horizontal coordinate. In the xy- coordinate plane, the slope is Δy/Δx. The slope of a displacement versus time graph is velocity. The slope of a velocity versus time graph is a. |

Magnitude | The size of a vector quantity, ignoring its direction. |

Kilometer(km) | 1,000 meters. |

Centimeter(cm) | 1/100 or 0.01 or 10^-2 meter. |

Derived Unit | A unit of measurement that can be expressed in terms of the fundamental international standard (SI). |

Micrometer | ( μm) One-millionth or 0.000001 or 10^-6 meter. |

Nanometer | (nm) One-billionth or 0.000000001 or 10^-9 meter. |

Millimeter (mm) | 1/1000 or 0.001 or 10^-3 meter. |

Decimeter (dm) | 1/10 or 0.1 or 10^-1 meter. |

Created by:
BMcCormack