1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Simple question

  1. Nov 9, 2009 #1
    Consider a circular loop. If I were to apply forces at all points on the loop such that the forces are perpendicular to it and in the same plane as the loop, the net force experienced by the loop equals zero. But it expands. The loop expands even when no work is being done on it. How can it be explained?
  2. jcsd
  3. Nov 9, 2009 #2
    perhaps because it is only at the CENTER of the circle where the net force is 0, and not the edges, which are the ones expanding..
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook