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Horizontal Kinematics

Horizontal Kinematics. Lecture #4: Acceleration & Graphs -. Focus: Who in here can throw the fastest punch/throw a ball the fastest on Wii Sports Mr. C ? ? ?. Clicker Quiz #3. A tail wind Adds to your velocity b ) subtracts from your velocity

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Horizontal Kinematics

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  1. Horizontal Kinematics

  2. Lecture #4: Acceleration & Graphs - Focus: Who in here can throw the fastest punch/throw a ball the fastest on Wii Sports • Mr. C • ? • ? • ?

  3. Clicker Quiz #3 • A tail wind • Adds to your velocity b) subtracts from your velocity 2) Light is the fastest thing in the universe • True b) False 3) What is positive? • Up b) down c) right d) left e) more than one of these 4) Is there such thing as absolute motion? a) Yes b) No

  4. Key Variables - Review Velocity – vector indicating the rate at which displacement changes with time. initial velocity (vi) – final velocity (vf) -

  5. Key Variable - New Definition – vector indicating the rate of change in velocity. Measured – indirectly using velocity, distance and time or using an ACCELEROMETER Units – m/s^2 almost never ft/s^2

  6. Key equation • Change in velocity a = Δv t

  7. Teacher Example C Pick three ways you can safely accelerate a car and describe how each is classified as acceleration.

  8. Teacher Example B Calculate the acceleration of a car that speeds up from rest to a velocity of 34 m/s east in 4 seconds

  9. Teacher Example A Determine the time it takes for a car to accelerate from 20 to 60 mph if it can accelerate at 8.6 m/s2

  10. Acceleration Examples How are these examples of acceleration?

  11. Student Example C Pick an activity other than driving and show three ways that you accelerate in that activity and why you would accelerate.

  12. Student Example B Calculate the final velocity of a car if it travels at 4 m/s west and accelerates at 1.2 m/s2 for 13 seconds

  13. Student Example A Calculate the time it takes for a car to come to a stop if initially travelling at 60 mph and capable of braking at 8 m/s^2

  14. Student Example A • Determine the final velocity if a car accelerates from 5 mph at 8.0 m/s^2 for 1 minute.

  15. Lecture : Acceleration & Graphs - REHASH Focus: Who in here can throw the fastest punch/throw a ball the fastest on Wii Sports • Mr. C • ? • ? • ?

  16. Clicker#4 Quiz • What are the standard units of acceleration? • mb) m/sc) sd) m/s^2 e)s/m 2) How can you measure acceleration? • Accelerometer b) RADAR c) meter stick d) photogatee) all of the above 3) Why should you slow down when its wet? a) Its a strain on the engine b) deceleration is reduced c) visibility is reduced d) reaction time is increased e) more than one of these

  17. Lecture #6: KME#1 Lecture: How to get out of a ticket? • Cry (girls only) • Make up an excuse • Take the ticket • Dazzle them with your physics knowledge

  18. Share experimental results

  19. 4 Kinematics Motion Equations vf = vi + at vf2 = vi2 + 2ad

  20. IFDAT • All equations have 4 variables in them vi= vf= d= a = t=

  21. Teacher Example - B Determine the final velocity of a plane that is initially at 200 m/s and has a negative acceleration of 5.0 m/s2 for 2000 m

  22. Teacher Example B Determine the acceleration of a car that can go from 0 to 60 miles/hour over the course 1300 meters

  23. Student Example - B Determine the final velocity of a plane that is initially at rest and accelerates at 10 m/s2 over the course of 25 seconds

  24. Student Example - B Determine the initial velocity of a car that accelerates at 1.8 m/s^2 to 25 m/s over the course of five seconds.

  25. Student Example - B Determine the time it takes for a car that goes from 0 to 60 miles / hour to cover a displacement of 1450 meters

  26. Getting out of a ticket Mr. C’s High School – James Madison HS, SA, TX 1996 Ford Taurus 0-100 mph in 8.7 seconds 122 m; Mr. C is pulled over for going 57 in a 40 does he have a defense?

  27. Lecture #6: KME#1 - Rehash Lecture: How to get out of a ticket? • Cry (girls only) • Make up an excuse • Take the ticket • Dazzle them with your physics knowledge

  28. Lecture : KME #2 Focus: How did they come up with those stopping distance/time rules in drivers ed? • Skid marks on the road • psychology • Years of fatal crashes • Math • All of these

  29. Final IFDAT Equations d = (1/2)(vi + vf)Δt d = vit+ (1/2)at2

  30. Teacher Example - B Determine the displacement of a plane that is initially at 25 m/s and accelerates to 60 m/s over the course of 400 seconds

  31. Teacher Example - B Determine the acceleration of a car that starts from rest and moves 1200 m while accelerating for 60 seconds

  32. Student Example - B What is the final velocity of a car that accelerates from 10 m/s for 10 seconds and covers 100 m?

  33. Student Example - B What is the initial velocity of a car that accelerates at 5m/s^2 for 8 seconds covering a distance of 800 m?

  34. Student Example – A** How long does it take a car to move 1200 m if it is initially moving at 10 m/s and accelerates at 1 m/s^2?

  35. Being safe… Determining a safe following distance with reaction time of 1.6 seconds

  36. Lecture #7: KME #2 - Rehash Focus: How did they come up with those stopping distance/time rules in drivers ed? • Skid marks on the roads • Psychology • Years of fatal crashes • Math • All of these

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