- #1
hri12
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Homework Statement
A book of mass M = .55 kg rests on a table where the coefficient of static friction us = .45. A force, F = 4 N acts on the book at an angle of 15 degrees above the surface of the table. What is the acceleration of the book if the coefficient of kinetic friction uk = .23?
Homework Equations
ΣFx = ma
ΣFy = ma
Ff = Fn(uk)
The Attempt at a Solution
I drew free body diagrams.
ΣFx = Fx - Ff
Fx - Ff = ma(x)
Fx - Fn(uk) = ma(x)
ΣFy = ma
Fn - Fy - mg = ma(y)
I'm not sure where to go from here. I know that I need to use Pythagoras theorem when I have the values of a(x) and a(y) but I don't know how to get that far.
Please help, I've been working on this for 2+ hours.