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# College Physics Ch.1

### College Physics A strategic Approach 2nd Ed ch 1 terms

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

define MOTION | The change of an object's position or orientation with time |

define TRAJECTORY | the path along which an object moves, which might be a straight line or might be curved |

define MOTION DIAGRAM | a composit image showing an object's position at several equally spaced instants of time |

define PARTICLE | an object that can be represented as a mass at a single point in space |

define MODEL | a simplificaation of reality |

define PARTICLE MODEL | a simplification in which we treat a moving object as if all of is mass were concentrated at a single point |

define ONE-DIMENSIONAL (1-D) | an object that can only move along a straight line. |

define POSITION | location of an object at a particular instance in time |

define ORIGIN | a fixed reference point from which all distances are to be measured |

define COORDINATE SYSTEM | an origin, and an axis marked in both the positive and negative directions |

define COORDINATE | the symbol that represents a position along an axis |

define DISPLACEMENT | a change of position |

define TIME INTERVALS | changes in time |

define UNIFORM MOTION | objects moving along a straight line at a constant speed |

define VELOCITY | the displacement of an object in a given time interval v=Δx/Δt |

define SIGNIFICANT FIGURES | a digit that is reliably known |

SI units for time | second (s) |

SI units for length | meter (m) |

SI units for mass | kilogram (kg) |

Common prefixes M | mega power of 10 6 |

Common prefixes k | kilo power of 10 3 |

Common prefixes c | centi power of 10 -2 |

Common prefixes m | mili power of 10 -3 |

Common prefixes μ | micro power of 10 -6 |

Common prefixes n | nano power of 10 -9 |

1 in = ?cm | 2.54 cm |

1 ft = ?m | 0.305 m |

1 mi = ? km | 1.609 km |

1 mph = ? m/s | 0.447 m/s |

1 m = ?in | 39.37 in |

1 km = ? mi | 0.621 mi |

1 m/s = ?mph | 2.24 mph |

define CONVERSION FACTOR | a ratio of values equal to 1 |

define ORDER OF MAGNITUDE ESTIMATE | a one-signficant-figure estimate or calculation such as estimate of speed indicated by ~ |

define SCALAR QUANTITY | a physical quantity is described by a single number with a unit - can be positive negative or zero |

define VECTOR QUANTITY | a quantity that has both a size (how far? how fast?) and a direction (which way?) Graphically represent a vector as an arrow over symbols |

define MAGNITUDE | the size or length of a vector |

define DISPLACEMENT VECTOR | displacement quantity having both magnitude and direction and can be represnted by a vector |

define VELOCITY VECTOR | points the direction of the objects motion and whole magnitude is the object's speed |