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Lab activity information

Lab activity information. Vi = 0 m/s T = 10 s Find d = Find v f =. Chapter 4 Problems. Guided Practice Problems. Problem #1. Find the uniform acceleration that causes a car’s velocity to change from 32m/s to change to 76 m/s. In an 8.0 s period. Problem #1. Unknown: a =. Given:

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Lab activity information

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  1. Lab activity information • Vi = 0 m/s • T = 10 s • Find d = • Find vf =

  2. Chapter 4 Problems Guided Practice Problems

  3. Problem #1 • Find the uniform acceleration that causes a car’s velocity to change from 32m/s to change to 76 m/s. In an 8.0 s period.

  4. Problem #1 • Unknown: • a = • Given: • Vi = 32 m/s • Vf= 76 m/s • T = 8.0 s

  5. Problem #1 • Equation: • A = Δv • Δt

  6. Problem #1 • Answer: 5.5 m/s/s

  7. Problem #1 • Solution: • 76m/s-32m/s / 8 s =

  8. Problem #2 • A supersonic jet flying at 155 m/s is accelerated uniformly at the rate of 23.1 m/s2 for 30 s. • A. What is its final velocity? • B. The speed of sound in air is 331 m/s. How many times the speed of sound is the plane’s final speed?

  9. Problem #2 • Unknown: • Vf = • Given: • Time = 30 s • A = 23.1 m/s2 • Vi = 155 m/s • ______________ • Vf = • Speed of sound is 331 m/s

  10. Problem 2 • Equation: A • Vf= vi + at

  11. Problem #2 • Equation B: • N= 848 m/s/331m/s=

  12. Problem #2 • Answer to A = 848 m/s

  13. Problem #2 • Answer to B:2.56 times

  14. Problem #2 • Solutions for A: • 155m/s + (23.1 m/s/s)(30.0 s) =vf

  15. Problem #2 • Solution for B : • 848 m/s/331m/s =

  16. Problem #3 • Determine the displacement of a plane that is uniformly accelerated from 66 m/s to 88 m/s in 14 s.

  17. Problem #3 • Unknown: d • Given: 66 m/s = Vi • 88 m/s = Vf • T = 14 s

  18. Problem #3 • Equation • D=(vf + vi)t/2 =

  19. Problem #3 • Answer #3: 550 m

  20. Problem #3 • Solution #3 : • (88 m/s + 66 m/s)14 s/2 =

  21. Problem #4 • If a bullet leaves the muzzle of a gun with a speed of 500 m/s, and the barrel of the rifle is .9 m long. What is the acceleration of the bullet while in the barrel?

  22. Problem #4 • Unknown: • A = • Given: • Vf = 500 m/s • D = .9 m • Vi = 0 m/s

  23. Problem #4 • Equation: • a = Vf2 – vi2 /2d

  24. Problem #4 • Answer :1.38 X 105 m/s/s

  25. Problem #4 • Solution: • (500 m/s)2-0 /(2) (0.9 m) =

  26. Problem #5 • A plane travels 600 m while being accelerated uniformly from rest at the rate of 5.0 m/s2. What final velocity does it attain?

  27. Problem #5 • Unknown: • Vf = • Given: d = 600 m • a= 5.0 m/s2 • Vi = 0 m/s

  28. Problem #5 • Equation: • Vf2 =vi2 + 2ad

  29. Problem #5 • Answer: 77.5 m/s

  30. Problem #5 • Solution: • Sq root 0 +2(5.0 m/s/s)(600 m) =

  31. Assignment • Page 82: 1,5, • Page 83 : 8,9,10, 16 • Page 84: 24, • Reviewing concepts: 1,2,3,8, • Applying concepts: 3, 8, 9 • Due thursday

  32. Equations of Motion for Uniform acceleration • Vivf a t • Vi d vf t • Vi d a t • Vfd vi a • Vf = vi + at • d = ½ (vf + Vi)t • d = vit + ½ at2 • Vf2 = vi2 + 2ad

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