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New Tao

New Tao. Bethany is testing her new Porsche. She drives it due east on 17 K for 1 mile. She makes this trip in 0.0139 hours. What was Bethany’s speed? What was Bethany’s velocity? Done Already? Tiny amount of Extra Credit: Should she have gotten a ticket?

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New Tao

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  1. New Tao • Bethany is testing her new Porsche. She drives it due east on 17 K for 1 mile. She makes this trip in 0.0139 hours. • What was Bethany’s speed? • What was Bethany’s velocity? Done Already? Tiny amount of Extra Credit: Should she have gotten a ticket? If Bethany came back with the same average speed, how long did her 2 mile trip take in minutes?

  2. Physics is Phun – Roller Coaster Reading • Ticket To Ride: The Physics of Extreme Machines • Please take 3 to 4 minutes to read this article. A question will be posted soon for you to answer on your Do Now Sheet.

  3. Article Question: • Please Label: 9/20 Reading: • In a sentence or two, using your own words, how would you explain a “G-force” to a 5th grader?

  4. Scientific American Website • Jennifer Ouellette • Context • Introduction to acceleration

  5. Homework • Castle Learning – Velocity and Acceleration

  6. Speeding Up and Slowing Down? Acceleration and Deceleration

  7. ACCELERATION • change in VELOCITY occuring over TIME • measured in METERS PER SECOND2 • VECTOR Negative Velocity Negative Velocity Positive Velocity Positive Velocity Negative Acceleration Negative Acceleration Positive Acceleration Positive Acceleration Slowing down Eventually speeds up in + direction! Slowing down Eventually speeds up in – direction! Speeding up in + direction Speeding up in - direction

  8. Equations • “An object’s velocity • at any point in time can • be found by considering: • - its starting velocity • its acceleration • the amount of time over • which it accelerates” “Acceleration is a rate of change in velocity” “The slope of a v-t graph tells what the ACCELERATION IS DOING!”

  9. Example • Car A starts with a velocity of -5 meters per second. At the end of 15 seconds, Car A has a velocity of +25 meters per second. • What is Car A’s acceleration? • If Car B has the same acceleration and begins at rest, what is its speed at 4 seconds? vf = vi + at vf = 0 m/s + (2 m/s2)(4 s) vf = +8 m/s vf = vi + at 25 m/s = -5 m/s + a(15 s) a = +2 m/s2

  10. Worksheet

  11. Closure • Is + 5 m/s an example of a speed, a velocity or an acceleration? • Why is acceleration considered a vector? • When slowing down in a car are the velocity and the acceleration in the same direction or opposite directions? • How is velocity different from acceleration?

  12. http://www.theuniverseandmore.com

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