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Warm Up

Warm Up. Which of these graphs is not like the others and why?. 0:09. 0:07. 0:06. 0:08. 0:04. 0:05. 4:00. 3:00. 2:00. 1:00. 0:03. 0:01. 0:02. 5:00. 0:10. Times Up. Bulletin Board. Readings Pages 14-19 Personal Practice # 4-8 on page 13. Speed & velocity.

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Warm Up

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  1. Warm Up Which of these graphs is not like the others and why? 0:09 0:07 0:06 0:08 0:04 0:05 4:00 3:00 2:00 1:00 0:03 0:01 0:02 5:00 0:10 Times Up

  2. Bulletin Board • Readings • Pages 14-19 • Personal Practice • # 4-8 on page 13

  3. Speed & velocity

  4. Position-time graph

  5. Speed Distance covered per unit of time.

  6. speed • Distance is a scalar. • \ Speed is a scalar. • What are some examples? • Speedometer on your vehicle. • Shutter speed for a camera. • Speed of light ~3×108 m/s

  7. speed • Distance is a scalar. • \ Speed is a scalar. • What are some examples? • Speedometer on your vehicle. • Shutter speed for a camera. • Speed of light ~3×105 km/s Constant Speed in vacuum

  8. Constant speed

  9. Constant speed Equal increments

  10. Constant speed Uniform Motion

  11. What about non-uniform motion? What is the speed here?

  12. Look at the overall distance. ? Calculate the Average Speed.

  13. Average Speed = =

  14. Average Speed = = Example: Zachary’s alarm was not set last night & he is in a hurry. He jumps on the bus & travels 12.6 km down Kennedy Rd for 12.0 minutes. He exits the bus at Sheppard Ave & waits 2 minutes & 34 seconds for the next bus to arrive. He then climbs aboard & travels for 15.0 minutes and exits the bus after 16.0 km. Don’t forget that the buses stop at every major street along the way. What is Zachary’s average speed? A = 17.7 m/s B = 16.1 m/s C = 58.0 km/h D = 63.6 km/h

  15. We can use this formula in many different ways: If David drives his vehicle at an average speed of 62 km/h every morning for 24 minutes on his way to school, then what is David’s distance from NTCS ? A = 24.8 km B = 0.043 km C = 1500 m D = 25000 m

  16. Group Questions Cell phone signals travel at an average speed of 300,000 km/s. How long will it take for a friend to get your text if you are in a city 1,350,000 km away? The grade 11 physics class decides to take a trip to Canada’s Wonderland. The bus travels at an average speed of 90 km/h. If the trip takes 27 minutes, how far is Canada’s wonderland from the school?

  17. Group Questions Cell phone signals travel at an average speed of 300,000 km/s. How long will it take for a friend to get your text if you are in a city 1,350,000 km away? The grade 11 physics class decides to take a trip to Canada’s Wonderland. The bus travels at an average speed of 90 km/h. If the trip takes 27 minutes, how far is Canada’s wonderland from the school?

  18. There’s more to the story.... Distance per unit time  Speed

  19. There’s more to the story.... Displacement per unit time  ?

  20. There’s more to the story.... Displacement per unit time  Velocity

  21. There’s more to the story.... Displacement per unit time  Velocity Vector same direction as displacement Vector

  22. Average Velocity Average Velocity =

  23. Example: What is the average velocity over the whole 7 seconds? What is the average velocity over the first 3 seconds? What is the average velocity over the last 3 seconds? What is the average velocity over the fourth second?

  24. Example: Notice that the average velocity for uniform motion is the slope of the line on a Position-Time graph.

  25. Example: There are two types of zero average velocity here. Can you spot them?

  26. Example: There are two types of zero average velocity here. Can you spot them?

  27. Group Problem: A train leaves the station and travels forward at a constant velocity of 100 km/hr for 15 minutes. It stops at the station for 2 minutes while passengers board and then continues at its original speed (100 km/hr) for another 20 minutes. What is the average velocity of the entire trip?

  28. Group Problem: A train leaves the station and travels forward at a constant velocity of 100 km/hr for 15 minutes. It stops at the station for 2 minutes while passengers board and then continues at its original speed (100 km/hr) for another 20 minutes. What is the average velocity of the entire trip?

  29. Work independently on today’s problem set

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