5-2. The coefficient of friction between the 200-15 homogeneous cylinder of Fig. PS-2 and horizontal plane is 0.4. The vertical plane is smooth. Deter- mine the frictional force exerted on the cylinder by the horizontal surface. 40t-b
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- The 3600-lb car with rear Wheel drive is attempting to tow the 4500-lb crate. The center of gravity of the car is at G, and the coefficients of static friction are 0.6 at B and 0.2 at C. Determine if the crate will slide.The two uniform sheets of plywood, each of length L and weight W, are propped as shown. If the coefficient of static friction is 0.5 at all three contact surfaces, determine whether the sheets will remain at rest.The 3600-lb car with rear wheel drive is attempting to push the 4500-lb crate. The center of gravity of the car is at G, and the coefficients of static friction are 0.6 at B and 0.2 at C. Determine if the crate will slide. (The car pulling the crate is analyzed in Prob. 7.19.)
- 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 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 104-lb force Pis applied to the 220-lb crate, which is stationary before the force is applied. Determine the magnitude and direction of the friction force Fexerted by the horizontal surface on the crate. The friction force is positive if to the right, negative if to the left. Assume 4, = 0.47, Hz = 0.38. Answer: F = Ib
- This climber (mass=52kg) is maintaining this posture while grabbing onto a rock at P3 and reaching for the wall with her right hand (no contact of wall and right hand). The rock at P1 applies a force of 187.4 N at an angle of 140.2 deg from the positive x axis on her right foot at P1. The rock at P2 and the climber's pants have a coefficient of static friction of 0.78 and the y component of the force of the rock on her pants is 144.0 N upward. The rocks at P1 and P2 are vertical surfaces. The friction forces acting at P1 and P2 are as large as friction will allow. Analyze the forces in the frontal plane as shown and show mechanical rationale for each question. a) What is the net interaction of the her left hand on the rock at P3? b) Which surface (P1 or P2) has a lower coefficient of static friction? If she took off her shoes and tried to hold this position with her socks (coefficient of static friction of her socks and rock is 0.78), will she be able to maintain static equilibrium? C)…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.The 517-N force is applied to the 95-kg block, which is stationary before the force is applied. Determine the magnitude and direction of the friction force Fexerted by the horizontal surface on the block. The force is positive if to the right, negative if to the left. P = 517 N 28° H, = 0.70 H = 0.54 Answer: F- i
- The 76-lb force P is applied to the 180-lb crate, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the crate. The friction force is positive if to the right, negative if to the left. Assume Ms = 0.43, Mk = 0.35. P Answer: F = i lbPrinciples ef Friction Tutovial 4 2507 4 m f 3 m a huvizuntal surtace and is acted as shoun alrove. Deter mnine the magnitude af tre force Fthat A 25 kg block rests on by an incline on farce will Cause the block to move. The coofsicentof friction between the two Contact surfaces is o.25. ANSWER: F= 69 NA 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 cm