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: What is the minimum angle?

  1. Jun 3, 2010 #1
    1. The problem statement, all variables and given/known data

    A box with mass of 45 kg is placed on a flat board. It starts moving when the board is inclined at 27 degrees. If the mass is doubled, what is the minimum angle needed so that it starts moving?

    2. Relevant equations

    Frictional force = mgsin[tex]\theta[/tex]

    3. The attempt at a solution

    Attached Files:

  2. jcsd
  3. Jun 3, 2010 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Your (or is it the book's?) solution is correct.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook