1. Jan 6, 2008

Clipse

1. The problem statement, all variables and given/known data
A uniform ladder of weight WL and length L has its top against a vertical wall with friction coefficient
μW and its foot on a smooth horizontal floor. A rope is attached to the foot of the ladder and secured
to the base of the wall, with the ladder making an angle α with the horizontal. If a man of weight WM
climbs the ladder, determine the tension in the rope when the man has climbed a distance d up the
ladder. What is the maximum tension in the rope?

2. Relevant equations
F=ma, applied to the contact with the wall, the floor and rope.

3. The attempt at a solution
So i know i have to use the moments of a force about a point, and that point doesnt matter, but itd be really helpful to show me which one is the easiest from a solving purpose. I need help with the maximum tension in the rope part, cant think of anything to be honest.

2. Jan 6, 2008

Staff: Mentor

Pick your favorite point! Just do it. (Hint: Pick one end of the ladder. Even better, pick both.)

In addition to moments, use force equations.

3. Jan 6, 2008

Clipse

Ok, im getting that T = R (normal with vertical wall) as there are no other forces in that direction. But that seems a bit simple no? Is the maximum tension in the string, the tension just before it breaks yes? So the tension when the the ladder is about to slip?

This is what happens when you leave 15 physics questions until the last night of your christmas break. Hahahahah.

Edit- My equations;
T = R
N - Wm- Wl+ Fr= 0