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accelaration rate of change in velocity over time. action force force acting in one direction average speed the total distance traveled divided by the time it takes to travel that distance inertia the tendency of an object to resist any change in its motion law of convervation of momentum momentum of any isloted system always remains the same momentum a property of all moving objects motion change in position newton the SI unit of force reaction force force acting in the opposite direction speed distance travelled per unit time velocity speed and direction