1. Limited time only! Sign up for a free 30min personal 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!

Torque problems-gravity

  1. Jul 12, 2013 #1
    Hello,

    I was working on a problem dealing with torque, and it was basically a long piece of wood resting on top of two metal poles. (scaffold like), and a worker standing on one end of the wood.

    When i was reading the solution, i noticed that gravity was factored in at the center of mass.
    I think this is because I chose the pivot point as the intersection of one of the metal poles and the piece of wood.

    My question is: is gravity in torque questions ALWAYS factored in at the center of mass??

    Thanks a lot!!
     
  2. jcsd
  3. Jul 12, 2013 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    hello oneplusone! :smile:
    yes …

    the total gravitational force on a body is always through the centre of gravity (that's for all purposes, not just for torque) …

    that's the definition of centre of gravity​

    we always assume that any apparatus on earth is in a uniform gravitational field,

    and in a uniform gravitational field, the centre of gravity and the centre of mass are the same (for fairly obvious reasons) :wink:
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Torque problems-gravity
  1. The Gravity Problem (Replies: 14)

  2. Gravity problem (Replies: 3)

  3. Problems in gravity (Replies: 1)

Loading...