1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Newton's Laws of Motions

  1. Oct 2, 2016 #1
    1. The problem statement, all variables and given/known data
    One or more external forces are exerted on each object enclosed in a dashed box shown in the figures below. Identify the reaction to each of these forces, assuming that (b) occurs on Earth. Select all that apply.
    SDDrMtd.png

    (b) the wagon exerts a force

    · downward on the Earth due to contact
    · downward on the Earth due to gravitational attraction
    · upward on the Earth due to gravitational attraction
    · upward to the left on the handle (???)
    · upward on the Earth due to contact

    (My choices in underline)
    3. The attempt at a solution

    The main question I have about this problem is whether the wagon exerts a force upwards to the left on the handle. I thought that the wagon would exert a force downwards to the left on the handle, but this isn't an answer choice, so I thought that selection would be a trick question.

    Thanks in advance!
     
    Last edited by a moderator: Oct 2, 2016
  2. jcsd
  3. Oct 2, 2016 #2

    BvU

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Hi Morrissey, :welcome:

    (better to keep one exercise per thread -- less confusing)

    Thread 1: I think I agree with your thinking.

    Thread 2: when ##m_1## is at rest, the maximum friction force is ##\mu_s N = \mu_s m_1 g##; you must first check if the driving force ##m_2 g## can exceed this.
     
  4. Oct 2, 2016 #3

    gneill

    User Avatar

    Staff: Mentor

    Note: the second exercise has been removed from this thread. The OP is invited to post it in a separate thread.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Newton's Laws of Motions
  1. Newton's Law of Motion (Replies: 3)

Loading...