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science(chapter3)
definition | term |
---|---|
the force that ttwo surfaces exert on each other when they rub against each other | friction |
sliding friction (example) | friction that occurs when one one solid surface slides over another (sliding a plate across the table) |
fluid friction | friction that occurs when an object moves through a fluid *bugs swimming through air* |
rolling friction | friction that occurs when an object rolls over a surface. *a ball rolling sown the hill* |
static friction | friction that acts between objects that aren't moving *trying to move a couch,but dont have enough force* |
the attractive force between object; the force that moves objects down hill | gravity |
mass | a measure of how much matter is in an object. |
the tendency of an object to resist change in motion | Inertia |
the state at which one object distance from another is changing | motion |
a place of object used for comparison to determine if an object is in motion. | reference point |
the distance an object travels per unit (calculation: S=distance/time) | speed |
the overall rate of speed which an object moves calculated by dividing the total distance an object travels by total time | average speed |
the speed of an object at one instant of time | instantaneous speed |
the steepness of a graph line; the ratio of the vertical change (the rise) to the horizontal change(run) | slope |
the rate at which velocity changes | acceleration |
the combination of all the forces on an object | net force |