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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
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