| A | B |
|---|
| resistance | the opposition to motion or flow |
| mechanical resistance | opposes motion between solid surfaces; friction |
| fluid resistance | opposes the flow of fluids |
| electrical resistance | opposes the flow of current |
| thermal resistance | opposes the flow of heat |
| directly proportional | value increase as another quantity increases |
| inversely proportional | value increases as another quantity decreases |
| Newton's First Law | objects at rest remain at rest |
| Newton's Second Law | a = F/m |
| gravitational acceleration | 9.8 meters per second per second |
| static friction | force required to start something moving |
| kinetic friction | force required to keep something moving |
| normal force | force between 2 surfaces pressed together |
| coefficient of friction | friction force divided by normal force |
| drag | frictional force on a solid moving through a fluid |
| laminar flow | streamlined flow of fluid particles around a solid |
| turbulent flow | irregular flow of fluid around a solid |
| pressure drag | fluid friction caused by turbulence |
| frictional drag | fluid friction caused by resistance between fluid layers |
| viscosity | internal fluid friction; the "runniness" of a fluid |
| Stokes' Law | calculates drag force on a sphere in a fluid |
| terminal speed | speed at which drag force equals weight |
| Poiseuille's Law | calculates volume flow rate through a pipe |
