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- The leather rein used to fasten the horse to the hitching rail weighs 3.5 oz per foot. The coefficient of static friction between the rail and the rein is 0.6. If a 34-lb force acting on the bridle is sufficient to restrain the horse, determine the smallest safe length L for the free end of the rein.The brake pads at C and D are pressed against the cylinder by the spring BF. The coefficient of static friction between each pad and the cylinder is 0.15. Find the smallest tension in the spring that would prevent the cylinder from rotating when the clockwise couple M=2200lbin. is applied. Neglect the weights of the members.Two identical chairs, each weighing 14 lb, are stacked as shown. The center of gravity of each chair is denoted by G. The coefficient of static friction is 0.2 at B (the contact point between the chairs) and 0.35 at A, C, and D. Determine the smallest force P that would cause sliding.
- The 40-lb spool is suspended from the hanger GA and rests against a vertical wall. The center of gravity of the spool is at G and the weight of the hanger is negligible. The wire wound around the hub of the spool is extracted by pulling its end with the force P. If the coefficient of static friction between the spool and the wall is 0.25, determine the smallest P that will extract the wire.The single-threaded screw of the floor jack has a pitch of 0.5 in. and a mean radius of 1.75 in. The angle of static friction is 8.5. (a) Determine the couple C that must be applied to the screw to start lifting a weight of 4000 lb. (b) What is the couple required to start lowering the weight?The single-plate clutch transmits the torque C from the input shaft on the left to the output shaft on the right. Compression springs between the clutch housing and the pressure plate provide the necessary pressure on the friction surface. The splines prevent the clutch plate from rotating relative to the output shaft. If Ri=4 in. and R0=9 in., determine the total force that must be applied to the pressure plate by the springs if the clutch is to transmit a torque of C=56lbft when it is new.
- The square-threaded screw 0f the C-clamp has a mean diameter of 8 mm and a pitch of 1.6 mm. The coefficient of static friction between the threads is 0.2. If the torque C=1.50Nm is used to tighten the clamp, determine (a) the clamping force; and (b) the torque required to loosen the clamp.2. The 100 – Ib force acts as shown on a 300 - Ib block placed on an inclined plane. The coefficients of friction between the block and the plane are us = 0.25 and Hk = 0.20. Determine whether the block is in equilibrium, and find the value of the friction for the friction force. 300 Ib 100 lbDetermine the value of the force P which will cause motion of the 25-kg block to impend up the 34° incline. The cylinder is fixed to the block and does not rotate. The coefficients of static friction are ₁ = 0.22 and ₂ = 0.38. H1 25 kg H₂ O 34° 24°
- A 40- kg block is placed on the uniform 10-kg beam, that is supported by the cable, which is attached to the end of the beam. The cable wraps around the pulley, and the cable is connected to the block. If the coefficient of the static friction between the block and the beam is u,-0.6. Neglecting friction forces in the pulley. Determine the maximum distance that the block can be placed from 0 and still remain in eqilibrium. Assume the block will not flip. Distanc Fig. (6) m B Pulley 30 cmThe two 200N blocks are pushed apart by the 15⁰ wedge of negligible weight. The angle of static friction is 12⁰ at all contacts surfaces. Determine the force P required to start the blocks moving.A 60-kg cabinet is mounted on casters that can be locked to prevent their rotation. The coefficient of static friction between the floor and each caster is 0.35. 3. If h = 600 mm, determine the magnitude of the force P (in N) required to move the cabinet to the right if the casters at A are locked and the casters at B are free to rotate. (ANSWER: 72.5)