The rail AB of negligible weight is suspended from a rope that runs around two fixed pegs. The coefficient of static friction between the rope and the pegs is 0.5. As the weight W moves along the rail toward end B, determine its position x when the rope is about to slip on the pegs.

Calculate the maximum force P that can be applied without causing any motion for the given coefficients of static friction. The weight of block A is 20 lb. and that of B is 10 lb. MB = 0.4 2 ft. B A 3 ft. MA=0.5 P MD=0.3 D Pc=0.35 C

Force P is applied to the end of a rope being used to hold the 50-lb block on the 20° incline. The coefficient of static friction between the block and the incline is u. = 0.30. Determine the largest value of P for which the block is in equilibrium and will not begin to move up the incline when 0 = 15°. Hs = 0.30 20° The solution to this problem requires a free-body diagram of the block, and a sketch of the coordinate system used. Use the components of the forces with EF = 0 and EF, = 0 to y apply ΣF=0.

Six 5 N blocks are stacked vertically. The coefficient of static friction between the blocks is µs = 0.20. Determine the horizontal force that must be applied to the fifth block from the top of the stack, in order to slide it out without moving the other blocks.