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Friction Area?

  1. Sep 19, 2005 #1
    I heard the Firction does not care about area or at least the friction equations do not have a varible for area, if that is true then why is it hard to pull something like a table when 4 legs are on the ground then when two legs are on the ground?

    - BeachMountain
    Last edited by a moderator: Sep 19, 2005
  2. jcsd
  3. Sep 19, 2005 #2


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    Friction depends on normal force. If the four legs of the table are on the ground, the whole weight of the table contributes to the normal force. If you lift two legs, you are supporting part of the weight, so the normal force is less.
  4. Sep 24, 2005 #3


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    SGT is exactly on the spot with the answer.
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