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December 20, 2014

December 20, 2014

Posted by **laurie** on Thursday, June 10, 2010 at 8:42am.

- physics -
**drwls**, Thursday, June 10, 2010 at 10:01amAll of the weight of ladder and person are balanced by the normal force F at the lower contact point, since the upper contact point is frictionless.

F = 1100 N

At the slipping condition, the friction force at the bottom is the maximum allowed by static friction, which would be 1100*0.75 = 825 N. It would be horizontal and pointed to the wall.

Now apply a moment balance using the three forces F, ladder weight and person weight. For simplicity, apply it at the upper (wall) contact point so you won't have to solve for the force there. You should be able to solve for the unknown position of the man.

- physics -
**um**, Saturday, November 17, 2012 at 11:01amdrwls can you show how u got the answer

- physics -
**swag**, Wednesday, March 26, 2014 at 1:08pmfff

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