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: Pushing wooden creat - Friction

  1. Sep 23, 2008 #1
    Hi guys I always confuse on this question its all about force.

    for example

    Let say I am pushing a wooden creat across the floor at constant speed.and I decide to turn the creat on end,to reducing by half the area in the contact with the floor . .........so if i push the same creat acroos the same floor with the same constant speed ....Does the force equall or one half greater or what???

    I am thinking it will be equall because area doesnt affect force. in the other hand i am thinking it one half because the friction will be less i guess.

    I am just confuse??????
  2. jcsd
  3. Sep 23, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    Re: problem

    In simple terms friction only depends on the normal force (weight) and the material of the two surfaces - it is independant of surface area (except for very small surface areas when you get direct welding).

    It is surprising to most people but it is true!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook