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# Physics 1 Unit 1

### Physics Unit 1

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

what is physics? | the study of interactions of matter & energy in all their diverse forms |

what is radiologic physics? | the study of the behavior of xrays, origin, and nature |

What makes up laws? | data makes up the laws from facts that clearly define natural occurences |

what makes up a theory? | laws makeup a theory; correlation of various laws in order to determine their conformity to a general pattern. |

what is a unit? | a quantity; adopted as a standard of measurement. can be used to measure quantities of the same kind |

What are base quantities? | quantities that are reserved and form the base of all other units |

What is another name for base quantities? | fundamental units |

what are the 3 base units of all systems? | length, mass and time |

what are the 4 systems of units? | british, SI, MKS, CGS |

what are derived units? | units that arrived by mathematically manipulating base quantities |

what are special units? | used to express special quantities that apply to certain fields |

what is mechanics? | deals with objects in motion or at rest |

what is velocity? | rate of change of its position with time. V= d/t |

What is acceleration? | rate of change of velocity with time |

what is the unit for acceleration? | m/s^2 |

what is the formula for acceleration? | a= velocity (f) - velocity (o) / t f=final; o=original |

what are Newton's 3 laws of motion? | law of inertia, definition of force, for every action there's an opposite and equal reaction |

what is weight? | (Wt) force on a body caused by a downward pull of gravity on it. |

what is the formula for weight? | Wt=mg; weight= mass * gravity |

T/F: the closer you are to the center of gravity, the greater the amount of pull. | true |

what is the formula for momentum? | p=mv; momentum= mass * velocity |

what is the law of conservation of momentum? | total momentum (p) before an interaction is equal to the total momentum (p) after interaction. |

what is work? | force applied to an object times the distance over which it is applied W=fd |

what is power? | the rate at which work is done (P)= work/time |

What is Energy? | the ability to do work |

what is the law of conservation of Energy? | energy cannot be created nor destroyed but CAN be converted from one energy to another. |

what is heat? | the random & disordered motion of molecules |

What is heat measured in? | calories |

what is a calorie? | 1 calorie is the amount of heat required to raise the temperature of 1 gram of water to 1 degree Celcius. |

Convert 58 degrees Fahrenheit into Kelvins. | 287.4 K |

Convert 56 degrees Celcius into Fahrenheit. | 132.8 F |

what are the 3 methods of heat? | conduction, convection, and thermal radiation |

what is conduction? | transfer of heat through a material or by touching |

what is convection? | mechanical transfer of hot molecules in a gas or liquid from one place to another; molecules get heated & become less dense making them rise |

what is thermal radiation? | transfer of heat by the emission of infrared radiation |

what is the unit of Energy? | ev (voltage) |

what is the property of matter that acts to resist a change in it's state of motion? | inertia |

what is the historical unit to express exposure? | Roentgen |

Push or pull on an object defines what? | force |

The SI unit of absorbed dose is what? | Gray |

Created by:
mokapis