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!

Pulling masses in different ways on a rough surface

  1. Sep 12, 2016 #1
    1. The problem statement, all variables and given/known data
    Snap1.jpg
    The coefficient of friction between the each mass and the floor are μM and μm respectively. which system accelerates faster under the same F in case:
    1) μM = μm
    2) μM < μm
    3) μM > μm

    2. Relevant equations
    Friction force: ##f=mg\mu##

    3. The attempt at a solution
    1) Both systems accelerate the same. case A:
    $$F-(M+m)g\mu=(M+m)a$$
    Case B:
    $$F-(Mg+T\sin\alpha+mg-T\sin\alpha)\mu=(M+m)a$$
    2)The acceleration is bigger since the net force available for accelerating is bigger. the left side of the inequality corresponds to A:
    $$F-[(M\mu_M+m\mu_m)g+(\mu_M-\mu_m)T\sin\alpha>F-(M\mu_M+m\mu_m)g$$
    3)The in verse of 2.
     
  2. jcsd
  3. Sep 12, 2016 #2

    BvU

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Helllo Karol,

    And what is it you need assistance with ?
     
  4. Sep 12, 2016 #3
    Nothing.... i thank you BvU
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Pulling masses in different ways on a rough surface
Loading...