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!

Rotating pool table, calculating max ang. velocity

  1. Mar 7, 2008 #1
    I am trying to calculate how fast you could rotate a pool table (at constant angular velocity) without the balls moving.
    Assumptions used: coeffecient of static friction=0.3
    table dimensions: 50in.X100in.
    So the farthest distance from the center is 111.8 in.
    I came up with about 9.7 rpm by setting radial acceleratio=R*omega=coeff. friction*g
    Can anyone check me on this, not sure if I did it right. Thanks!
  2. jcsd
  3. Mar 7, 2008 #2


    User Avatar
    Science Advisor

    The balls would roll. Your calc would work only for a flat object.
    You need to include "rolling friction" (Which is not really friction) to keep the balls from rolling. The coefficient of static friction does not enter your calculation, except to determine when the balls would start to skid.
    Rolling friction can be determined by lifting the table until the balls start to roll.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Rotating pool table, calculating max ang. velocity
  1. Pool table problem (Replies: 10)

  2. Rotating a pool ball (Replies: 9)