A ladder of weight 200N and 4m long rest on a horizontal ground and against a
vertical wall making an angle of 60 degree with ground. The coefficient of
friction between the ladder and the wall is 0.2. The ladder slips when a person
weighing 800N tries to climb the ladder and travels 2.7m along ladder. Determine
the coefficient of friction between the ladder and the ground.
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A uniform ladder 4 m long weighs 200 N. It is placed against a wall making an angle of 60° with the floor. The coefficient of friction between the wall and the ladder is 0.25 and that between the ground and the ladder is 0.35. The ladder in addition to its own weight, has to support a man of 1000 N at the top at B. Calculate: (i) The horizontal force P to be applied to the ladder at the ground level to prevent slipping. (ii) If the force P is not applied, what should be the minimum inclination of the ladder with the horizontal, so that it does not slip with the man at the top?
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