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  1. Bulletin Board • Reading • Pages 28-39

  2. Acceleration Non-uniform Motion

  3. Review The motion of a remote control car can be represented by a graph.

  4. Review The motion of a remote control car can be represented by a graph.

  5. Review The motion of my caliber can be represented by a graph.

  6. Review ? The motion of my caliber can be represented by a graph.

  7. Review The motion of my intrepid can be represented by a graph.

  8. Uniform Motion – no change in velocity

  9. Uniform Motion – no change in velocity Notice that when Motion is Uniform, the instantaneous velocity is the same as the average velocity for every interval of time.

  10. Non-Uniform Motion – velocity changes

  11. Calculate the change - Δ

  12. Calculate the change - Δ

  13. Calculate the change - Δ What are the units?

  14. Calculate the change - Δ Acceleration is a vector!

  15. Group Questions Shaddy is flying an airplane East across the ocean. He realizes that he started the decent too late and now must bring his speed down from 450 km/h to 300 km/h in 1 minute. Is this a greater deceleration that what you feel in a car? Caroline’s model airplane needs to achieve a velocity of 20 m/s before it can take off. It is capable of accelerating at a rate of 0.80 m/s2. What is the shortest runway that she can use to operate her plane? (two parts to this question) Hint: The area under a V-T graph is displacement.

  16. Instantaneous Acceleration What is the instantaneous acceleration?

  17. Example: While driving to work this morning, Mr. West drove from his apartment (the origin) to the school down Victoria Park. The following is a Position-Time graph of his Non-Uniform motion. Find the instantaneous acceleration for each interval of time. What is the greatest acceleration Mr. West felt?

  18. Example: First, we find the velocity for each point.

  19. Example: Next, we calculate the instantaneous acceleration.

  20. Fun with applets: Work on problem set in your groups.