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Speed & Velocity

Speed & Velocity. Speed is the rate of change of distance. V = d/t Velocity is the rate of change of displacement . V= d/t These both use total distance (or displacement) with the total time. SO, the result is the AVERAGE rather than the specific speed at any particular moment. .

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Speed & Velocity

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  1. Speed & Velocity Speed is the rate of change of distance. V = d/t Velocity is the rate of change of displacement. V= d/t These both use total distance (or displacement) with the total time. SO, the result is the AVERAGE rather than the specific speed at any particular moment.

  2. What was the average speed of Usain Bolt’s world record 100.0 m dash, completed in 9.58 s? d = 100.0 m t = 9.58 s v = v = 100.0 9.58 v = 10.4 m/s (37.6 km/h)

  3. A person drives 35km east in 35 minutes, then 52km west in 48 minutes. Calculate average speed and velocity in km/h.

  4. |The one-miler (1.60934 km) world record is 3:43.13 . • What is the average speed for the mile in m/s and km/h?

  5. Average Speed not what you think!

  6. Average speed = total distance total time Average speed is usually used when the speed is not constant. For example: A student walks 55.0m in 9.0 minutes and then runs 45.0m in 1.0 minute. Average speed1 = 55.0m = 0.102m/s 540s Average speed2 = 45.0m = 0.750m/s 60s

  7. 0.102m/s +0.750m/s 0.852m/s 2 = 0.426m/s The average speed would be 0.426m/s If we found the average the usual way…

  8. Try it this way… average = total distance speed total time average = 55 + 45 = 100m speed 540 + 60 600s average = 0.167m/s speed

  9. 0.426m/s vs 0.167m/s 0.426m/s is the middle number between 0.102m/s and 0.750m/s The average speed is 0.167m/s because that number better represents what the student did. It is much closer to the 0.102m/s number because that is what was happening most of the time, and therefore should be weighed heavier than the 0.750, which didn’t happen for very long. Why the discrepancy?

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