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