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PH 211 Winter 2014

PH 211 Winter 2014. Friday January 24. Midterm rooms. Wednesday 1/29 and 2/19 from 8:30 to 9:50pm Weniger 151:   A-J Weniger 116:  K-R Weniger 153:  S-Z. Google moderator. Which topic would you like to discuss in class on Monday? http://www.google.com/moderator/#16/e=2108a3.

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PH 211 Winter 2014

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  1. PH 211 Winter 2014 Friday January 24

  2. Midterm rooms Wednesday 1/29 and 2/19 from 8:30 to 9:50pm Weniger 151:   A-J Weniger 116:  K-R Weniger 153:  S-Z

  3. Google moderator Which topic would you like to discuss in class on Monday? http://www.google.com/moderator/#16/e=2108a3

  4. Google moderator Today’s questions: http://www.google.com/moderator/#16/e=20c5fe

  5. Reaction time Mean RT for college-age individuals is approximately 190 milliseconds to detect visual stimulus About 20 folks with responses larger than 1, some as large as 200! Nobody very small, except one zero.

  6. They all fall down A small rock is attached to a helium filled balloon which goes up at a constant speed of 25 m/s. When the balloon reaches 250m, it pops, and the rock falls down. How long does it take for the rock to hit the ground? Find the closest answer. • -3 s • 7 s • 10 s • 17s • Not enough info to solve the problem

  7. A small rock is attached to a helium filled balloon which goes up at a constant speed of 25 m/s. When the balloon reaches 250m, it pops, and the rock falls down. How long does it take for the rock to hit the ground? Find the closest answer. • -3 s • 7 s • 10 s • 17s • Not enough info to solve the problem 132 of 133 :42

  8. Combining motion in two directions Demo: What are your observations, conclusions?

  9. Conclusions,which are correct? • The ball and cart are still connected. • There is a force between the ball and cart. • Relative velocity is all that matters. • It is just a math thingy. • You just showed us the one case where it worked, it means nothing.

  10. Conclusions,which are correct (multiple response, hit ENTER for submission! • The ball and cart are still connected. • There is a force between the ball and cart. • Relative velocity is all that matters. • It is just a math thingy. • You just showed us the one case where it worked, it means nothing. 0 of 207 14

  11. Combining motion in two directions See http://paer.rutgers.edu/pt3/experiment.php?topicid=2&exptid=94

  12. Motion in two directions Another experiment See also http://paer.rutgers.edu/pt3/experiment.php?topicid=2&exptid=96 Did they show the correct frame speed?

  13. Did they show the correct frame speed? If the tower is 1m tall and there are 30 frames per second, the fall will take how many frames?

  14. If the tower is 1m tall and there are 30 frames per second, the fall will take how many frames? • 5 • 9 • 13 • 17 • 21 0 of 207 1

  15. For free fall motion the horizontal and vertical components of the motion are independent!Note: this is no longer true when forces like friction are there!

  16. Monkey and hunter,big game See http://www.physics.umn.edu/video.html?goback=/outreach/pforce/circus/&url=/media/outreach/pforce/circus/videos/MechanicsProjectileMotion-MonkeyAndHunter.flv&vidname=Physics%20Force:%20Monkey%20and%20Hunter

  17. Falling bullets See http://www.youtube.com/watch?v=D9wQVIEdKh8

  18. Three dimensions.

  19. We see an arrow in a tree, 12m above the ground, pointing downwards at an angle of 45○. The person firing the arrow was 2m tall and stood 22m from the tree. Under what angle did the person fire the arrow?

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