Posted by **Jessica** on Sunday, November 7, 2010 at 11:40pm.

A uniform ladder 5.0 m long and weighing 200 N is placed against a very smooth wall so that the lower end of the ladder is 3.0 m from the wall. If the coeficient of friction between the ladder and the ground is 0.50, determine the maximum distance that a 700 N man could climb along the length of the ladder before the ladder slips.

- Physics -
**Damon**, Monday, November 8, 2010 at 3:13am
3,4,5 triangle

Vertical forces

200 N down at middle, 1.5 m from foot of ladder

700 N down at (3x/5) from foot of ladder

900 N up at foot of ladder

Horizontal forces

F at top of ladder, 4 m above base

900 mu at base of ladder = F at top

take moments about

base of ladder

700 (3x/5) + 200(1.5) - 4F = 0

but F = .5*900 = 450

so

700(3x/5) +300 = 1800

420 x = 1500

x = 3.57

- Physics -
**Costa**, Sunday, December 11, 2011 at 2:01pm
what about the friction?

- Physics -
**d**, Monday, November 4, 2013 at 6:02pm
where did the 3x/5 come from

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