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avsj
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Homework Statement
A uniform 15kg ladder whose length is 5.0 m stands on the floor and leans against a vertical wall, making an angle of 25 degrees with the vertical. Assuming that the friction between the ladder and the wall is negligble, what is the minimum amount of friction between the ladder and the floor that will keep the ladder from slipping?
Homework Equations
Torque = Fdistance
Fg = mg
And possibly : Ff= 1/2mgtan(x)
also can Fg = 1/2mg because we're delaing with torques? if so why?
The Attempt at a Solution
I tried making force vectors perpendicular to (torque) and straight down (gravity) and finding horizontal components (bottom of triangle...so friction?) but could not arrive at the correct answer which is 34 N but would really really appreciate it if someone could help me understand this.
Thanks a lot