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Published byEleanore McCormick Modified over 9 years ago
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Section 1: Describing Motion
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Speed Speed is how far you travel over a period of time. Speed is expressed in the formula s=d/t (speed = distance/time). If you walk 20 meters over 10 seconds, this formula would show that you have a speed of 2 m/s.
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Average speed Average speed is used to calculate the speed traveled over a total distance in a certain time. If you drive 360 miles to Florida over 6 hours time, the formula s(average) = d(total)/t(total) will calculate that you have traveled at an average speed of 60 miles per hour.
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Instantaneous Speed Instantaneous speed is how fast you are traveling at a given time. Think of a speedometer on a car. Unless you are using cruise control, the speed you are traveling changes all the time. This is instantaneous speed which shows how fast you are going at that particular instant.
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Graphing speed A distance-time graph shows the change in distance of an object over a time interval. The slope formed on the graph shows an object’s speed.
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Velocity Velocity is simply speed plus direction. Where 15 mph is a speed, 15 mph south is a velocity. So, can you travel at a constant (unchanging) speed but still have a changing velocity? Yes, velocity changes due to a change in speed, direction or both speed and direction.
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