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Old Apr 25th 2009, 06:27 PM   #1
s3a
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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!
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Old Apr 25th 2009, 06:42 PM   #2
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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.
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Old Apr 26th 2009, 12:34 AM   #3
s3a
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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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