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### 11 Cards in this Set

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 Speed The rate at which an object moves. (distance /time) Average speed the average distance traveled (total distance/total time) Constant speed steady unchanging speed. Velocity distance traveled per unit time (distance/time) Acceleration The rate at which an object's velocity changes with time. (final velocity – original velocity /time) Frame of reference background or object that is used for comparison Momentum The product of an objects mass and velocity (mass*velocity) Force a push or pull exerted on an object (mass*acceleration) Friction & 3 types A force that one surface exerts on another when the two rub against each other. The three types are fluid, rolling, sliding. Mechanical advantage The number of times a force is exerted on a machine is multiplied by the machine. 6 types of simple machines and examples of each inclined plane (ramp) wedge (zipper) , the screw (jar lids), the lever (crow bar), the wheel and axle (doorknob), and the pulley (flagpole rope)