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### 15 Cards in this Set

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 sentence When you know both the speed and direction of an object's motion, you know the velocity of the object. acceleration the rate at which velocity is changes sentence An object is in motion if it changes position relative to a reference point. velocity speed in a given direction sentence To determine the acceleration of an object, you must calculate the change in velocity during each unit of time. SI a system of measurement based on multiples of ten and on established measures of mass, length, and time plate one of the major pieces that make up the Earth's upper layer motion the state in which one object's distance from another is changing meter the basic SI unit of length how many cm in a km? 10,000 cm in a km speed the distance an object moves in one unit of time what units is speed measured in? a plate-cm or mm a car-miles reference point a place or object that is used for comparision to deterine if something is in motion sentence According to their explantion, known as the the theory of plat techonics, Earth's plates move ever so slowly in various directions. what units is acceleration measured in? meters per hour square