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Homework Help: Newton’s laws ii

  1. Mar 1, 2010 #1
    Hi guys I am new with physics and having a hard time wraping my head around things.

    A worker pulls horizontally on a rope that is attached to a 10-kg crate resting on a rough floor. The coefficients of static and kinetic friction are 0.5 and 0.3, respectively. The worker pulls with a force of 40 N. The frictional force exerted by the surface is

    A) 40 N B) 50 N C) 10 N D) 100 N E) 30 N

    I would like to know the steps or hints on how to solve this?
  2. jcsd
  3. Mar 1, 2010 #2


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    We can't give you the steps without your attempt, but for starters, how do you calculate (what are the equations) static and kinetic friction forces? Please follow the template as you post. And welcome to PF!
  4. Mar 1, 2010 #3
    Ah sorry, new myself, sorry Phanthom.
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