Physics Help Forum Horizontal vs Vertical Surfaces with Friction

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Apr 25th 2009, 07:27 PM #1 Senior Member   Join Date: Mar 2009 Posts: 129 Horizontal vs Vertical Surfaces with Friction When pushing an object such as a book across a horizontal surface such as a table, my book says the following: μ = Ff/FN where: μ: coefficient of friction Ff: force of friction FN: Normal force I understand the above very well but my book did not explain how friction acts along a vertical surface. Let's say I scrapped a rock on a brick wall or something, how would I determine the normal force? I ask because my book says that FN = Fg = m*g if the surface is horizontal. I understand that perfectly but how would I find the value of FN mathematically if the object was fighting friction on a vertical surface? Any help would be greatly appreciated! Thanks in advance!
 Apr 25th 2009, 07:42 PM #2 Senior Member     Join Date: Apr 2008 Posts: 815 The normal force N would be the horizontal component of the net force acting on the body, if it moves vertically and along the vertical surface. __________________ Isaac If the problem is too hard just let the Universe solve it.
 Apr 26th 2009, 01:34 AM #3 Senior Member   Join Date: Mar 2009 Posts: 129 The force exerted by me lets say if I were grinding a rock on a wall would be FN = Fnet = m*a?

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# friction cofficient at verticle surface

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