Monday, January 14, 2013

Period 9 Mid Term Review

The idea of forces is on the exam... Most importantly that they are vectors and behave as such.
The total FORCE= Net Force=(Fnet)=ma
Or simply Fnet=ma

There are only to possibilities when it comes to Fnet:
They add up to zero (equilibrium)
Or they don't and the object accelerates.
Here are some sample questions:

https://www.box.com/s/22v28qs6dx7uosh4iw8z

Answers:
https://www.box.com/s/8j5bo5gdrwvsr2nwcvm2

You are permitted to bring one side 8.5x11 inch paper with hand written equation sheet you may include diagrams but no notes.

There is no curve!!!
It is a Pre determined standard.
80 correct = 100
70=90
60=80
50=70
48=68


Posted by Positively 4th Street at 1:34 PM

31 comments:

  1. Jon NazhaTuesday, January 15, 2013 at 8:38:00 PM EST

    Are there 80 questions exactly? What if we get like 75 correct?

    ReplyDelete
    Replies
    1. AnonymousWednesday, January 16, 2013 at 10:22:00 PM EST

      Its an 100 for 80 questions but it could still be an A for 75
      -Haley

      Delete
    2. AnonymousTuesday, January 22, 2013 at 8:24:00 PM EST

      i thought he said there were 100 questions but 80 correct would still be a 100 or something. i thought there was some slack

      Delete
    3. Kati GroenWednesday, January 23, 2013 at 12:06:00 AM EST

      yeah, he said there were 100 questions, and if you get at least 80 correct it is a 100%, 70 questions = 90% etc

      Delete
  2. AnonymousWednesday, January 16, 2013 at 8:24:00 AM EST

    For forces, like on the worksheet, what is the units for magnitude? Is it Newtons or something different?
    Mary Frances Wenig

    ReplyDelete
  3. AnonymousWednesday, January 16, 2013 at 9:31:00 PM EST

    If you get 75 correct you probably get a 95 -jessie higbee

    ReplyDelete
  4. AnonymousWednesday, January 16, 2013 at 10:15:00 PM EST

    Jon, there are 100 questions.
    -Lexy Leeds

    ReplyDelete
  5. AnonymousWednesday, January 16, 2013 at 10:16:00 PM EST

    http://www.physicstoday.org/daily_edition/physics_update/mercury_levels_in_the_south_china_sea

    This is really interesting!
    -Lexy Leeds

    ReplyDelete
  6. AnonymousWednesday, January 16, 2013 at 10:21:00 PM EST

    I thought this was a cool idea ! check it out ! http://blogs.physicstoday.org/newspicks/2013/01/better-online-shopping-recommendations-thanks-to-particle-physics/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+physicstoday%2Fpt2+%28Physics+Today+News+Picks%29

    - Haley Krachman

    ReplyDelete
  7. AnonymousWednesday, January 16, 2013 at 11:18:00 PM EST

    That's a good article Haley. I never realized that online purchase recommendations and DVD rentals involved physics! I looked up more about particle physics to understand it better. If anyone else was interested, this is the website I read about it on....

    http://www.particlephysics.ac.uk/index.html

    -Lexy Leeds

    ReplyDelete
  8. AnonymousThursday, January 17, 2013 at 8:59:00 AM EST

    Is that series of topics on the phreshman physics post applicable to us or did they/us cover more?
    -Robert Grabowski

    ReplyDelete
  9. AnonymousThursday, January 17, 2013 at 7:29:00 PM EST

    Is the notebook check only for the end of the year? -Jess Higbee

    ReplyDelete
    Replies
    1. AnonymousTuesday, January 22, 2013 at 11:00:00 AM EST

      Yes, I believe he only checks it once at the end of the year for a test grade or something like that.
      -Mary Frances Wenig

      Delete
  10. Ms. ScannellTuesday, January 22, 2013 at 6:26:00 PM EST

    Can someone help me understand #7 on the midterm review. I don't understand how to get the answer 7.3 m

    -Kayla Scannell

    ReplyDelete
    Replies
    1. Kati GroenWednesday, January 23, 2013 at 12:25:00 AM EST

      given in the problem is:
      a=-9.8m/s^2 (gravity)
      v0=12m/s (the speed it was launched up at)
      d0=0m (the ground)
      df=0m (it goes back down to the ground)

      use the equation d=1/2at^2+v0t+d0
      after everything is plugged in you get:
      0=1/2(-9.8)t^2+12t
      0=-4.9t^2+12t
      factor out a t
      0=t(-4.9t+12)
      t doesn't equal 0 obviously so solve just for
      0=-4.9t+12
      t=1.224sec
      now plug that into d=at^2+v0t+d0 again but don't plug in 0 for d! d is now what you are solving for so
      d=-4.9(1.224)^2+(12)(1.224)=7.3m

      Delete
    2. AnonymousWednesday, January 23, 2013 at 4:11:00 PM EST

      it's just like the shoot for an A lab!
      First you have to solve for time using a= -9.8 m/s^2, v-initial = 12m/s,
      d initial = 0 and d final = 0.
      0=-4.9t^2+12t+0
      Solving for t gives you 0 and 2.448 seconds (quadratic formula or factor out a t), and t can't be 0 so the time it takes for the ball to go from 0 meters to 0 meters is 2.448 seconds. The time it takes to reach its maximum height would be half of that, or 1.224 seconds (its like a parabola, its maximum is right in the middle).
      Then you plug 1.224 back into your equation which will give you the distance the ball travels until it reaches its max.
      d=-4.9(1.224)^2 + 12(1.224) + 0 = 7.3

      Delete
  11. Kati GroenWednesday, January 23, 2013 at 12:31:00 AM EST

    for the cheat sheet are we allowed to also write notes like equilibrium means 0 or things like that or can it only be strictly equations?

    ReplyDelete
    Replies
    1. AnonymousWednesday, January 23, 2013 at 3:56:00 PM EST

      He said no notes or explanations but you can draw pictures and write equations.

      Delete
  12. AnonymousWednesday, January 23, 2013 at 5:13:00 PM EST

    if someone could explain 9,26,30,38,41 and also inertia i'd really appreciate it.

    ReplyDelete
  13. UnknownWednesday, January 23, 2013 at 6:43:00 PM EST

    How is everyone else studying , just looking over notes?

    ReplyDelete
    Replies
    1. Jennifer StrengerWednesday, January 23, 2013 at 9:30:00 PM EST

      that, the stuff linked in the post, and also making the cheat sheet thing is designed to help you study

      you could also use the textbook

      Delete
  14. UnknownWednesday, January 23, 2013 at 7:10:00 PM EST

    Wait! Is there 100 or 80 questions I'm confused? Or is it 100 question and we can can get 80 right for a 100?

    -Arsene E.

    ReplyDelete
    Replies
    1. AnonymousWednesday, January 23, 2013 at 7:51:00 PM EST

      i'm pretty sure its 100 questions, if you get 80 correct its a 100.

      Delete
  15. UnknownWednesday, January 23, 2013 at 7:11:00 PM EST

    Also for the cheat sheet is it front and back or just the back?

    ReplyDelete
  16. Ms. ScannellWednesday, January 23, 2013 at 7:40:00 PM EST

    I think it is just one side of the paper and we are allowed to put formulas and graphs but no notes

    ReplyDelete
  17. UnknownWednesday, January 23, 2013 at 7:58:00 PM EST

    its just the front of the paper handwritten-Megan Lavery

    ReplyDelete
  18. UnknownWednesday, January 23, 2013 at 8:02:00 PM EST

    Ok thx

    ReplyDelete
  19. UnknownWednesday, January 23, 2013 at 8:12:00 PM EST

    Hey, how do you find the distance in # 7 in the Exam review. https://www.box.com/s/22v28qs6dx7uosh4iw8z

    ReplyDelete

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