2. Two men are sliding a 100-kg crate up an incline. If the lower man pushes horizontally with a force of 500 N and if the coefficient of kinetic friction is 0.4. determine the tension T which the upper man must exert in the rope to maintain motion of the crate. 30 100 kg 15 = 0.40

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 lb

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. 1. If h = 600 mm, determine the magnitude of the force P (in N) required to move the cabinet to theright, if all the casters are locked. (ANSWER: 206) 2. 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 B are locked and the casters at A are free to rotate. (ANSWER: 178)

Ross and Rachel are fighting if they were on a break. Ross is trying to get his stuff weighing 150. N placed on an inclined plane by pulling it upwards parallel to the inclined plane with 150. N force. However, Rachel is trying to stop Ross by exerting 50.0 N perpendicular to the inclined plane. The coefficients of friction between the box and the incline are us= 0.450 and = 0.350. Which of the following shows the most ideal force diagram for the object? A. C. 30⁰ 30* 50 N W 50 N 150 N 180 N B. D. 30⁰ 30⁰ 50 N FRIENDS 50 N 50 N 150 N 150 N 150 N

2. The two 200-lb blocks are pushed apart by the 15° wedge of negligible weight. The angle of static friction is 12° at ali contact surfaces. Determine the force P required to start the blocks moving. 1515 200 lb 200 lb

1. Assuming F is 90lb, coefficient of static friction 48 =0.2, and the coefficient of kinetic friction uk-0.16. Determine the distance the 100 lb crate moves in 2 seconds. F 30° 2.The crate shown in the figure has a mass of 120 kg., coefficient of static friction HS=0.6, and the coefficient of kinetic friction uk=0.5. Determine the tension in which the winch must exert on the cable to start the crate to slide up. Hint: the coefficient of static friction is used to determine the maximum friction force the surface can support.

2. Find the least value of P required to cause the system of blocks to have impending motion to the left. The coefficient of friction is 0.2 under each block. 300 Ib 100 lb 30 °

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)

Determine the magnitude and direction of the friction force exerted on the 100-lb block when (a) 0= 15°, (b) 0= 30°. For both parts, let P 120 lb. Draw separate FBDS for each part of the problem. %3D

A 250 lb refrigerator is being pushed. You do not know what force P should be applied. The coefficient of static friction between the refrigerator and floor is lg = 0.4. The center of gravity of the refrigerator is at point G. - d2 -- d2 F1 d3 d1 d4 Values for the figure are given in the following table. Note the figure may not be to scale. Variable Value di 4.5 ft d2 1.5 ft d3 2.5 d4 3.5 a. Determine the force P that is needed to overcome friction. b. Determine the location of the normal force r measured from the center of the refrigerator if the force P from part a is applied. c. Determine the minimum force P that is required to tip the refrigerator. d. Will the refrigerator slip or tip first? Round your final answers to 3 significant digits/figures. P= lb ft Pip = lb Will the refrigerator slip or tip first? tip O slip