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21 Cards in this Set

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 When is an object in motion? When its distance from a reference point is changing What is a reference point? a place/object used to determine if something is in motion How can you tell if an object is in motion? When its postion changes relative to a reference point What does SI stand for? International System of Units What is the SI basic unit of length? Meter How would you find the average speed? Divide total distance by total time What is velocity? Speed in a given direction What is a slope? The steepness of a line on a graph Earth's rocky outer shell is in.. several pieces. What are plates? The upper layer of Earth that consists of more than a dozen pieces What is the theory of plate tectonics? Earth's plates move ever so slowly in various directions What do Earth's plates do? -Push toward each other -Slide past each other -Pull away from each other By knowing the average speed of a plate, what can scientists estimate about Earth's continents? They can estimate of how the continents moved in the past, present, and in the future. What is acceleration? The rate at which velocity changes Acceleration involves a chang ein what two components? Speed & direction What is another word for negative acceleration? Deacceleration When does an object experience accerlation? Any time th espeed of an object increases Can an object be accelerating even if the speed is constant? Why? Yes, because the object is changing direction What must you calculate to determine the acceleration of an object? Calculate the change in velocity during each unit of time What is a linear relationship on a speed graph? What does it mean? The line is straight; acceleration is constant What is a nonlinear relationship? What does it mean? The line is curved; acceleration varies over time