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PART 2: Concept Attainment:

PART 2: Concept Attainment:. PART 2: Concept Attainment:. CONSTANT Velocity. CHANGING Velocity. IF velocity changes… THEN there is an acceleration. Magic Triangle!. OR…. So…just what exactly IS acceleration?. Let’s say a car has an acceleration of 2 miles per hour per second ;

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PART 2: Concept Attainment:

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  1. PART 2: Concept Attainment:

  2. PART 2: Concept Attainment: CONSTANT Velocity CHANGING Velocity IF velocity changes… THEN there is an acceleration

  3. Magic Triangle! OR…

  4. So…just what exactly IS acceleration? Let’s say a car has an acceleration of 2 miles per hour per second; in other words: 2 mi h . s WHAT DOES THAT MEAN? Brainstorm with the people around you… Every 1 SECOND, the car’s velocity is INCREASING by 2 miles per hour.

  5. A car has an acceleration of 2 miles per hour per second; in other words: 2 mi h . s

  6. A car has an acceleration of 2 miles per hour per second; in other words: 2 mi h . s

  7. A car has an acceleration of 2 miles per hour per second; in other words: 2 mi h . s Predict the car’s velocity for the next 5 seconds

  8. This chart shows data for a CONSTANT, POSITIVE acceleration

  9. Clicker Concept Review • Now that you have the FORMULA for acceleration, let’s see how well you can CONCEPTUALLY understand it. • These questions are NOT in your POGIL • However, this PowerPoint is on my website; feel free to print out the slides at home. Or, you can write your work on loose leaf now.

  10. Two people are driving down the street; 1 in an old VW Beetle and 1 in a new Maserati. The person driving the Beetle goes from 25 to 30 mph in 5 seconds. The person in the Maserati takes his/her time, and goes from 25 to 30 mph in 30 seconds. WHICH CAR HAS THE LARGER ACCELERATION?

  11. Two people are driving down the street; 1 in an old VW Beetle and 1 in a new Maserati. The person driving the Beetle goes from 25 to 30 mph in 5 seconds. The person in the Maserati takes his/her time, and goes from 25 to 30 mph in 30 seconds. WHICH CAR HAS THE LARGER ACCELERATION? • The Beetle • The Maserati • Same acceleration • Not enough info to say • Not sure

  12. Two people are driving down the street; 1 in an old VW Beetle and 1 in a new Maserati. The person driving the Beetle goes from 25 to 30 mph in 5 seconds. The person in the Maserati takes his/her time, and goes from 105 to 110 mph in 30 seconds. WHICH CAR HAS THE LARGER ACCELERATION? • The Beetle • The Maserati • Same acceleration • Not enough info to say • Not sure

  13. Same change in v Think CONCEPTUALLY using EXAGGERATED EQUATIONSBeetle Maserati Different times Different accelerations

  14. Remember… • Directly proportional vs. Inversely Proportional

  15. So, are ACCELERATION and TIME directly or inversely proportional? • Directly • Inversely • Not sure

  16. Now, the person driving the Beetle goes from 25 to 45 mph in 20 seconds. The person in the Maserati goes from 25 to 125 mph in 20 seconds. WHICH CAR HAS THE LARGER ACCELERATION?

  17. Now, the person driving the Beetle goes from 25 to 45 mph in 20 seconds. The person in the Maserati goes from 25 to 125 mph in 20 seconds. WHICH CAR HAS THE LARGER ACCELERATION? • The Beetle • The Maserati • Same acceleration • Not enough info to say • Not sure

  18. Different change in v Think CONCEPTUALLY using EXAGGERATED EQUATIONSBeetle Maserati Same times Different accelerations

  19. So, are ACCELERATION and CHANGE IN VELOCITY directly or inversely proportional? • Directly • Inversely • Not sure

  20. & / or & / or & / or

  21. POGIL • Aim to FINISH the POGIL…some may. Some may not. • Remember to check in at STOP SIGNS • We ARE NOTreviewing as a class. • We are stopping with 5 minutes left in class. • Up to #19 is HW

  22. 20. True or False: Acceleration ONLY occurs if the speed INCREASES • True • False • Not enough info to say • Not sure

  23. 21. If velocity in a vehicle is CONSTANT, is the vehicle accelerating? • Yes • No • Not enough info to say • Not sure

  24. 22. Suppose you are driving a car at a constant velocity of 50 mi/h. What is your acceleration? • 0 • Less than 50, but not 0 • More than 50 • Not enough info to say • Not sure

  25. 23. Suppose a car moving in a straight line steadily increases its speed each second, first from 35 to 40 km/h, then from 40 to 45 km/h, then from 45 to 50 km/h, What is its acceleration? • 0 • 5 km/h s • Less than 5 km/h s • More than5 km/h s • Not sure

  26. 24. In 5 seconds a car moving in a straight line increases its speed from 50 km/h to 65 km/h. During those same 5 seconds, a truck goes from rest to 15 km/h. Which has the larger acceleration? • Car • Truck • Same • Not sure

  27. 25. Is it possible to be moving but not accelerating? • Yes • No • Not enough info to say • Not sure

  28. 26. Why is it that an object can accelerate while traveling at constant speed, but not at constant velocity?

  29. 27. Light travels in a straight line at a constant speed of 300,000 km/s. What is the light´s acceleration? • 0 • Less than 300,000 but not 0 • More than 300,000 • Not enough info to say • Not sure

  30. 28. Which has more acceleration when moving in a straight line- a car increasing its speed from 50 to 60 km/hr, or a bicycle that goes from zero to 10 km/hr in the same time? • Car • Bike • Same • Not enough info to say • Not sure

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