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Bell Ringer

Bell Ringer. 2. You throw a ball upward into the air with an initial velocity of 30m/s. It lands on back in your hands. What is the total number of seconds that it was in the air ( Hang Time )? 3 seconds 6 seconds 9 seconds 30 seconds.

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Bell Ringer

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  1. Bell Ringer 2. You throw a ball upward into the air with an initial velocity of 30m/s. It lands on back in your hands. What is the total number of seconds that it was in the air (Hang Time)? • 3 seconds • 6 seconds • 9 seconds • 30 seconds • 1. A police officer issues a fine for speeding based upon one’s: • Average Speed • Acceleration • Instantaneous Speed

  2. Bell Ringer • 1. A bullet is fired straight down from the top of a high cliff. Neglecting air resistance, the acceleration of the bullet in meters per second per second is: • less than g • g • more than g 2. Jessica throws a baseball upwards with an initial velocity of 3.2 m/s. What is the velocity of the ball when it reaches its maximum height? • 6.4 m/s up • 3.2 m/s down • 0 m/s • 1.2 m/s down

  3. Bell Ringer 2. Which of the following are the units for acceleration? (hint: more than one answer) a) m/s2 b) km/hr s c) m/s d) miles 1. Which of the following is not accelerating? • A car slowing to a stop at a stop sign • You riding a Ferris Wheel • The moon orbiting the Earth • A cyclist riding constantly at 2 m/s on a straight path

  4. Bell Ringer • Which line represents the faster car? • In a sentence, describe the motion of the object at lines A, B and C. Distance Distance C B A Time Time

  5. Observations????? Star Wars Car Demo

  6. Acceleration

  7. What pedal is this? Using terms we’ve learned, what does this pedal do? Changes the rate of speed over time

  8. Acceleration • The rate at which an object changes its velocity and/or direction

  9. Galileo rolled balls down a series of ramps. As the ramps got higher, the balls rolled at a greater speed. Their speed increased. Galileo said that they were….. Accelerating.

  10. Acceleration • Acceleration occurs when an object • Speeds up (+) • Slows down (-) • Change in direction • Units: m/s2 Acceleration= Final velocity – initial velocity Time Accel = ΔV t

  11. Positive & Negative Acceleration • Positive acceleration • “speeding up” • Negative acceleration • “slowing down”

  12. Practice Problem #1 • If a car starts from rest, and reaches a speed of 100 m/s in 10 seconds, what is the acceleration?

  13. Practice Problem #2 • What is the acceleration when a car slows down from 100 km/hr to 60 km/hr in 5 seconds?

  14. Practice Problem #3 • What is the acceleration of a dragster that reaches a speed of 200 miles/hr in 4 seconds?

  15. Work Sheet • Work on the Acceleration worksheet with your shoulder partner

  16. Graphing Constant Motion • Constant Velocity: when an object travels the same amount of distance in the same amount of time. Distance Distance Time Time

  17. Graphing Constant Motion • Both lines show that each object moved the same distance but the steeper line got there before the other one. • Which one of these lines would represent our Runner and Walker from yesterday’s lab???

  18. Distance Distance Time Time Velocity Velocity Time Time

  19. Graphing Acceleration • Each time interval the object is traveling a greater distance • The object has positive acceleration

  20. Graphing Acceleration Distance Time Velocity Time

  21. Graphing Acceleration Distance Time Velocity Time

  22. Describe the motion in each of these graphs. Distance Time Velocity Time

  23. Practice Problem • Describe the motion of the object at each part on the graphs. Distance C F E B D A Time Velocity Time

  24. Practice Problem #1 • With your partner, draw a d vs. t graph that shows a car moving at a constant speed.

  25. Practice Problem #2 • Draw a d vs. t graph that shows a car with (+) acceleration (speeding up).

  26. Practice Problem #3 • Describe each part of the graph with words. Distance C B A Time

  27. Practice Problem #4 Distance • Describe each part of the graph with words. C B A Time

  28. Velocity vs. Time

  29. Bell Ringer 2/01/11 • What is acceleration? • Which of the following are the units for acceleration? (hint: more than one answer) a) m/s2 b) km/hr s c) m/s d) miles • Which of the following is not accelerating? • A car slowing to a stop at a stop sign • You riding a Ferris Wheel • The moon orbiting the Earth • A cyclist riding constantly at 2 m/s on a straight path

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