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| What is necessary to describe motion? |
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| system of objects that are not moving with respect to one another |
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| movement in relation to a frame of reference |
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| length of path betweentwo points |
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| Measuring displacement (KEY!!) |
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| displacement is the direction from the starting point and the length of a straight line from the starting point to the ending point |
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| quantity that has magnitude and direction |
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| vector sum of 2 or more vectors |
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| ratio of the distance an object moves to the amountof time the object moves |
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| average speed and instantaneous speed (KEY!!) |
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| average speed is computed for the entire duration of a trip and instantaneous speed is measured at a particular instant |
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| formula for speed or average speed |
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average speed= total distance/ total time or v= d/t |
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| is the rate at which an object is moving at a given moment in time |
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| the slope of a line on a distance-time graph is speed |
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| the speed and direction in which an object is moving |
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| velocity is a description of...... |
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| both speed and direction of motion. velocity is a vector |
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| two or more velocities add by vector addition |
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| the rate at which velocity changes |
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| acceleration can be described as..... |
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| changes in speed, changes in direction, or changes in both. Acceleration isa vector |
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| the movement of an object towards earth solely because of gravity |
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| a steady change in velocity |
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acceleration= changes in velocity/ total time or a= Vf- Vi/ t |
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| graphs of accelerated motion |
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| slope of a speed-time graph is acceleration |
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| the displayed data on the graph form straight-line parts |
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| distance-time graphs (nonlinear graph) |
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| a curve connects the data points that are plotted |
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| instantaneous acceleration |
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| how fast a velocity is changing at a specific instant |
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| motion is described with respect to a |
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| displacement is distance combined with |
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