1. Not finding help here? Sign up for a free 30min 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!

Newton third law

  1. Oct 30, 2007 #1
    a box of books weighing 325N moves with a constant velocity across the floor when it is pushed with a force of 425N exerted downward at an angle of 35.2 degree below the horizontal . find the coefficient of kinetic friction between the box and the floor.

    what i do :please see check it

    the coefficientof kinetic friction equal to the force of kinetic divided by the normal force = 425-425xcos35.2 / 325+425xsin35.2 = 0.136
  2. jcsd
  3. Oct 30, 2007 #2


    User Avatar
    Homework Helper

    Yes. You are right.
  4. Oct 30, 2007 #3
    are u sure ?
  5. Oct 30, 2007 #4


    User Avatar
    Staff Emeritus
    Science Advisor

    Where does the first 425 come from on the numerator? What much the frictional force be equal to?
  6. Oct 30, 2007 #5


    User Avatar
    Homework Helper

    Yes.You are right,Cristo. Only 425cos35.2. Sorry.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Newton third law
  1. Third Law of Newton (Replies: 8)

  2. Newtons third law (Replies: 2)