is required to pro- The 20-N force shown in Fig. duce impending motion of the block on the inclined sur- face. If the mass of the block is 10 kg, determine the coef- ficient of friction between the block and the surface. F = 20 N 18 28°
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- 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 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 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 two homogeneous bars AB and BC are connected with a pin at B and placed between rough vertical walls. If the coefficient of static friction between each bar and the wall is 0.25, determine the largest angle 6 for which the assembly will remain at rest.The 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If the force required to start the spool rotating is F = 160 lb, determine the coefficient of friction between the ground and the spool. Neglect the diameter of the spindle compared to the diameter of the spool.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.
- If the center of gravity of the stacked tables is at G,and the stack weighs 100 lb, determine the smallestforce P the boy must push on the stack in order tocause movement. The coefficient of static friction atA and B μs = 0.3. (The tables are locked together) Answer: P = _____________The wedge is used to level the member. Determine the reversed horizontal force -P that must be applied to pull the wedge out to the left. The coefficient of static friction between the wedge and the two surfaces of contact is 1s = 0.15. Neglect the weight of the wedge.Two blocks A and B meet incontact as shown in the figure. If hecoefficients of static friction for allthe surfaces in contact is 0.2,Determine whether the 50-lb force moves theblock A up, keep balance,or move block A down,shifting block B to the right.
- If block A and wedge B have masses. What is the mass of block C if it is on the verge of slipping? All surfaces have a coefficient of static friction of μ. The cable connecting wedge B and block C is parallel with the incline. Use g = 9.806 m/s². Indicate the direction of impending motion for each FBD. μ = 0.15Mass of A = 64kgMass of B = 130 kgα = 22°β = 12°The motorcycle weighs 151 kg and the driver weighs 64 kg. Dimension l1 = 0.31 m and l2 = 0.23 m Determine the required coefficient of frictionIn the system shown, determine the value of the force Fif the coefficient of friction between the body and floor is 0.41. P=102.309N