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!

Some doubts regarding rotational dynamics

  1. Mar 9, 2012 #1
    a) suppose we tie a ball with a string and rotate it keeping its other end tied with one of our fingers then the only external force acting on it is the tension. Which force then cancells 'mg' acting vertically downward?

    b) if a mass is rotating in a circular path then in which direction does the net external force acting on it acts?
     
  2. jcsd
  3. Mar 9, 2012 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Not exactly sure what you are describing. But if you twirl the ball on the end of a string in a horizontal circle, the string will make an angle with the horizontal. The net vertical force will be zero.
    What do you think?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Some doubts regarding rotational dynamics
  1. Rotational dynamics (Replies: 3)

  2. A doubt regarding torque (Replies: 11)

  3. Rotational Dynamics (Replies: 1)

Loading...