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hellocello
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Homework Statement
A student is trying to push a desk of mass m = 110kg and horizontal width w = 0.7m along the floor. The coefficient of friction between the desk and the floor is ms = 0.56. The center of mass of the desk is at the geometric center of the rectangle shown. If the force that is applied is just barely less than what is necessary to move the desk, what is the maximum height h so that the desk won't tip over?
Homework Equations
torque= Fl
Net torque= 0 in equilibrium
The Attempt at a Solution
net torque= 0
Fapplied*h - Ffriction*l +Fgravity*l -Fnormal*l =0
The friction force creates no torque if the desk is rotating around an axis on the ground because l will be zero. Then the gravity and normal forces cancel out. But my textbook doesn't include the normal force in the equation- why?