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A ladder with a length of 4 metres and a weight of 15 kg rests on the wall. Determine the distances to which the 90-kg painter can climb without causing the ladder to slip at its lower end A. The top of the ladder has a small roller, and at the ground the coefficient of static friction is 0.25. The mass centre of the painter is directly above her feet.

Tomas Bata University in Zlín
Faculty of Applied Informatics
PROBLEM 5:
A ladder with a length of 4 metres and a weight of 15 kg rests on the wall.
Determine the distance s to which the 90-kg painter can climb without
causing the ladder to slip at its lower end A. The top of the ladder has a
small roller, and at the ground the coefficient of static friction is 0.25. The
mass centre of the painter is directly above her feet.
S
4 m
A
1.5 m
6
B

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