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!

Homework Help: Centripetal Motion + Friction = Impossible?

  1. Feb 12, 2008 #1


    User Avatar

    1. The problem statement, all variables and given/known data

    An air puck of mass .25 kg is tied to a string and allowed to revolve in a circle of radius 1.0 m on a frictionless horizontal table. The other end of
    the string passes through a hole in the center of the table, and a mass of 1.0 kg is tied to it. The suspended mass remains in equilibrium while the puck on the tabletop revolves.

    a. What is the tension in the string? Answer: 9.8
    b. What is the speed of the puck? Answer:: 6.26
    c. If the table is not frictionless, but instead is made of a material with a coefficient of friction u=0.45, how do your answers for a) and b) change? (answer: ?)

    2. Relevant equations


    3. The attempt at a solution

    I'm not sure. How would the situation even apply? (I only need help with part c).
    Last edited: Feb 13, 2008
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted