unit 7 science vocab
About this set
Created by:
jcotterbein on April 30, 2012
Subjects:
Log in to favorite or report as inappropriate.
Order by
10 terms
Terms | Definitions |
|---|---|
 Sliding friction | a force exerted between two surfaces sliding against each other (must be moving) |
| static friction | a force exerted between two surfaces trying to slide against each other (but not yet moving) |
| lubricant | a fluid used to reduce friction by creating a thin layer between the microscopic "hills and valleys of a surface" |
| ball bearings | small rotating spheres that reduce friction by changing sliding motion into rolling motion |
| torque | the measure of how much twisting force causes an object to rotate |
| lever arm | the perpendicular distance from the axis of rotation to the line of action of the force. it is a factor used in calculating torque. |
| line of action | an imaginary line in the direction of a force and passing through the point where the force is applied |
| axis of rotation | a point around which an object rotates |
| rotational equilibrium | a condition that occurs when all the torques applied to an object add to zero (balanced torques) |
| rotational inertia | a measure of how resistive an object is to rotation. it depends on the objects mass and how the mass is distributed. its symbol is "I" |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.