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### 6 Cards in this Set

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 The motion of an object is determined by its what? By its change of postion relative to a reference point. Speed is the distance an object travels in one unit of time. If an object moves at a constant speed, how can its speed be determined? By dividing the distance it travels by the time taken. If an object's speed varies, then dividing distance by time gives you the object's average speed. When you state both the speed of an object and the direction in which it is moving, you are describing an object's... Velocity How do the plates that make up Earth's outer layer move? They move very slowly and only centimeters per year, in various directions. Acceleration is the rate at which velocity changes. It involves... Increasing speed, decreasing speed, or changing direction. How can acceleration be calculated? By dividing the change in velocity by the amount of time it took that change to occur.