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### 15 Cards in this Set

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 The Location of a place or an object Position A Location to which other locations are compared Reference Point A change of position over time Motion A measure of how fast something moves Speed A speed in a specific direction Velocity A quantity that has both size and direction Vector The rate at which velocity changes over time Acceleration Distance/Time = Speed (Final Velocity - Intial Velocity) / Time = Acceleration Bill knows that a friend runs 200m in 10 sec. What is the speed? How do you know? 20 m/s 200m / 10 sec = 20 m/s Tom walked 10 km in half hour. What is his average speed during the walk? How do you know? 20 km/hr 10 km / .5 hr = 20 km/hr Jim and Tom run with the same constant speed but in opposite directions. The boys have... Different Velocity A cheetah can go from 0 m/s to 20 m/s in 2 seconds. What is the acceleration? How do you know? 10 m/seconds squared (20 m/s - 0 m/s)/ 2sec = 10 m/s*s A car traveling at 40 m/s slows to 20 m/s. The car has... How do you know? Negative Acceleration (20 m/s - 40 m/s)/ time = a negative number; thus negative acceleration If two trains are traveling at 60 mph, could they have different Velocity's? Yes, they could be going in different directions.