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**Speed measures how fast position changes**

Section 1.2 Outline Speed measures how fast position changes

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**Position can change at different rates**

speed: a measure of how fast something moves rate at which distance changes compared to time a measurement; can be fast or slow speed and position are related by time – speed measures how quickly position change

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A. Calculating Speed objects that travel at different speeds move different distances in the same amount of time 2) S = d/t (S = speed, d = distance, t = time)

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**B. Average Speed speed is not constant; it is always changing**

moment-to-moment speed (instantaneous) is difficult to measure easiest to calculate average speed over a distance

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**C. Distance-Time Graphs**

shows how speed relates to distance and time shows how both distance and speed change with time a flat, or horizontal, line shows a speed of 0 m/s time is on horizontal, or x-axis and distance is on vertical, or y-axis

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**II. Velocity includes speed and direction**

1) velocity: a speed in a specific direction 2) example: 3 m/s south

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**A. Velocity 1) to calculate, need both speed and direction**

2) vector: a quantity that has both size and direction 3) represented by an arrow (size and direction)

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**B. Velocity versus speed**

two objects may have same speed, but different velocities average speed depends on total distance traveled average velocity depends on total distance from starting point

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