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FizziksGuy

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Posts posted by FizziksGuy

  1. Draw separate free body diagrams for each of the objects, showing the direction of the forces on each object.  For example, for the (2m) mass, you would have a dot with an arrow to the left (T3), and an arrow to the right (T2).  The up and down arrows (forces Fn up and mg down) are balanced, so we'll focus on the x-direction.  Writing Newton's 2nd Law in the x-direction, since T2 is in the positive direction, we'll leave it as positive, and since T3 is in the -x direction, it will be negative.  Therefore T2-T3 = (2m)a.

     

     

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  2. There are several explanations I think.  I would probably use the kinematic equations (v0, v, delta_x, a, t), and use those to solve the problem.  If you're getting stuck, can you post what you've done so far, and that will give me better information to assist you?

  3. This is a very common type of question, and the process of breaking up forces on a FBD into components and applying Newton's 2nd Law carries throughout the entire course.  One of those things you've gotta learn.  :angel:   The "shortcut" that you learned isn't really a shortcut, and isn't something I'd recommend, as it won't carry through to other situations in which the third force isn't caused by gravity on a mass.  I'd focus on learning how to draw free body diagrams, break forces at angles into components, and applying Newton's 2nd Law.  It's the backbone of mechanics, and very important in further units as well.  Good luck!

  4. Name: AP Physics C 2017 Mechanics Free Response Solutions
    Category: Exam Prep
    Date Added: 2017-08-20
    Submitter: FizziksGuy

    Walk-through of the 2017 AP Physics C: Mechanics Free Response Questions. Questions can be found at https://apcentral.collegeboard.org/pd....

    For more information, please visit APlusPhysics.com. You can also check out the new AP Physics C Companion: Mechanics, a guide book designed to assist in your studies of AP Physics C: Mechanics. Both black-and-white and full-color versions available from Amazon.com: http://amzn.to/2vPCvB3

    *AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work.



    AP Physics C 2017 Mechanics Free Response Solutions

  5. Name: AP Physics C 2017 E&M Free Response Solutions
    Category: Exam Prep
    Date Added: 2017-08-20
    Submitter: FizziksGuy

    Walk-through of the 2017 AP Physics C: Electricity and Magnetism Free Response Questions. Questions can be found at https://apcentral.collegeboard.org/pd....

    For more information, please visit http://APlusPhysics.com.

    *AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work.



    AP Physics C 2017 E&M Free Response Solutions

  6. Name: AP Physics 1 2017 Free Response Solutions
    Category: Exam Prep
    Date Added: 2017-08-20
    Submitter: FizziksGuy

    Walk-through of the 2017 AP Physics 1 Free Response Questions. Questions can be found at https://secure-media.collegeboard.org...

    For more information, please visit http://aplusphysics.com

    *AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work.



    AP Physics 1 2017 Free Response Solutions

  7. Name: AP Physics 2 2017 Free Response Solutions
    Category: Exam Prep
    Date Added: 2017-08-20
    Submitter: FizziksGuy

    Walk-through of the 2017 AP Physics 2 Free Response Questions. Questions can be found at https://apcentral.collegeboard.org/pd....

    For more information, please visit http://aplusphysics.com.

    Looking for help in AP Physics 2? Check out my course guidebook, AP Physics 2 Essentials: An APlusPhysics Guide!  http://amzn.to/2vPMA0H

    *AP and Advanced Placement Program are registered trademarks of the College Board, which does not sponsor or endorse this work.



    AP Physics 2 2017 Free Response Solutions

  8. Looks like you're making progress, but hopefully your pilot doesn't have to test out his parachute next time.  Looks like you're having some trouble embedding pictures... please see me or one of your classmates for the next mission reports so we can see a visual record of your triumphs!

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