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PH 211 Winter 2014

PH 211 Winter 2014. Monday February 17. Midterm rooms. Wednesday 2/19 from 8:30 to 9:50pm Note sheet 8.5 by 11 is OK Format like midterm 1 Weniger 151:   A-J Weniger 116:  K-R Weniger 153:  S-Z. Midterm material. Problems based on chapters 5,6,7 Need to know chapters 1,2,3,4

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PH 211 Winter 2014

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  1. PH 211 Winter 2014 Monday February 17

  2. Midterm rooms Wednesday 2/19 from 8:30 to 9:50pm Note sheet 8.5 by 11 is OK Format like midterm 1 Weniger 151:   A-J Weniger 116:  K-R Weniger 153:  S-Z

  3. Midterm material • Problems based on chapters 5,6,7 • Need to know chapters 1,2,3,4 • Chapter 8 need to know

  4. Lab calendar update << Tuesday 2/11 Lab 5 >> << Thursday 2/13 Lab 4 >> • Tuesday 2/18 NO LAB • Wednesday 2/19 MIDTERM 2 • Thursday 2/20 Lab 5

  5. Midterm pickup Office hours Tuesday 14:00-15:30 • Compare your exam and solutions. • Come to office hours for questions. • If asking for re-grading, use form from web-site, and follow procedure.

  6. Google moderator Which topic would you like to discuss in class on Wednesday? http://www.google.com/moderator/#16/e=210d02

  7. Google moderator Which topic would you like to discuss in class on today? http://www.google.com/moderator/#16/e=20e597

  8. Consider a horse standing on the ground. Is the following statement true? The force of the earth on the horse and the force of the ground on the horse are “3rd law pairs”: • yes • no

  9. Consider a horse standing on the ground. Is the following statement true? The force of the earth on the horse and the force of the ground on the horse are “3rd law pairs”: • True • False 0 of 209 1

  10. The box is sitting on the floor of an elevator. The elevator is accelerating upward. The magnitude of the normal force on the box is n > mg. n = mg. n < mg. n = 0. Not enough information to tell. Slide 6-52

  11. The box is sitting on the floor of an elevator. The elevator is accelerating upward. The magnitude of the normal force on the box is • n > mg. • n = mg. • n < mg. • n = 0. • Not enough information to tell 142 of 209 1

  12. Newton 3 Act on different objects! a b

  13. F1 F2 F1 F2 F3 Forces on any object are due to other objects F3

  14. F1 F2 F1 F2 F3 Focus on main object F3

  15. 7.48What is tension? T T T T 3d Law Pair 3d Law Pair

  16. 7.48What is tension? T T T T Net force zero pair

  17. 7.48What is tension? T T Fwalker,rope

  18. 6.66 FDrag = bv FGravity = mg

  19. In case a the weight of the hanging block is 10 N, in case b the tension force is 10 N. The big block is AT REST. Compare the FORCES on the big block is the same in both cases. The forces are: • The same • Greater on the left • Greater on the right • I have no idea At rest! T = mg.

  20. In case a the weight of the hanging block is 10 N, in case b the tension force is 10 N. Compare the ACCELERATIONS of the two systems. (the big block is the same in both cases) The acceleration is: • The same • Greater on the left • Greater on the right • I have no idea 10 N

  21. In case a the weight of the hanging block is 10 N, in case b the tension force is 10 N. Compare the ACCELERATIONS of the two systems. (the big block is the same in both cases) The acceleration is: • The same • Greater on the left • Greater on the right • I have no idea 149 of 209 :01

  22. What is the acceleration of the 2.0 kg block across the frictionless table?

  23. What is the acceleration of the 2.0 kg block across the frictionless table?

  24. What is the acceleration of the 2.0 kg block across the frictionless table? • . • . • . • . • . 137 of 209 59

  25. T m1 m1g

  26. T m2 T

  27. What is the acceleration of the 2.0 kg block across the frictionless table?

  28. When is tension in a rope equal to the weight of a mass that is hung from the rope? • Always • When the mass moves with constant velocity or is stationary • Anytime the mass is falling • Only when the mass is stationary • Never

  29. When is tension in a rope equal to the weight of a mass that is hung from the rope? • Always • When the mass moves with constant velocity or is stationary • Anytime the mass is falling • Only when the mass is stationary • Never 0 of 209 1

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