A 100-N crate is sitting on a 200-N crate as shown The rope that joins the crates passes around in Fig. a frictionless pulley and a fixed drum. The coefficient of friction is 0.30 at all surfaces. Determine the minimum force P that must be applied to the 200-N crate to start motion. F12m 0.5 m 30 100 N 2.5 m 200 N P

A 100-N crate is sitting on a 200-N crate as shown The rope that joins the crates passes around in Fig. a frictionless pulley and a fixed drum. The coefficient of friction is 0.30 at all surfaces. Determine the minimum force P that must be applied to the 200-N crate to start motion. F12m 0.5 m 30 100 N 2.5 m 200 N P

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.3P: Two identical chairs, each weighing 14 lb, are stacked as shown. The center of gravity of each chair...

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Repeat Prob. 4.152 assuming that the 400-kN force is applied at O instead of L.
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.
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A 100 N force acts as shown on a 30.6 kg block placed on an inclined plane. The coefficients of friction between the block and the plane are µs = 0.25 and µk = 0.2. Determine whether the block is in equilibrium and find the value of the friction force.
The weight of the motorcycle is 151 kg and the weight of the driver is 64 kg. Dimensions: l1 = 0,31 m and l2 = 0,23 m Determine the required frictional force.
Q3/ A screw-jack is used to lft a load of 4 kN. The screw of the screw-jack is square threaded with two threads to 1 cm. If the co-efficient of friction between the nut and screw is 0,095 and outer diameter of screw s 6 cm, find the force required atthe end of the handle of length 50 cm to ift the load. (20 M)
A 2-m long concrete traffic barrier is used to provide safety for workers, pedestrians, and motorists during highway construction. The concrete has 0.024 N/cm3 specific weight. The interface between the barrier and pavement has static and kinetic coefficients of friction of 0.45 and 0.4, respectively, and h= 45 cm. Determine the force P that will cause motion of the barrier.
The system is used to lift a block with mass 300 kg. If the friction coefficient between twoblocks, and between a block and a surface, are 0.20 and 0.35, respectively, what is the minimum force Prequired such that the object is about to be lifted? Assume weights of the blocks to be negligiblecompared to lifted weight. (g=9.81)
A 85-kg man starts climbing a ladder that leans against a wall as shown in Figure Q1. If the ladder is 5 m long and weighs 10 kg. Determine the normal reaction (in N) at the vertical surface if the coefficient of friction is 0.25 at the top vertical surface and 0.4 at the bottom horizontal surface.
A body of mass 30 kg is resting on a horizontal plane. A pull of 80 N is subjected on the body and tends the body to move. Will the body move if coefficient of friction between the body and the plane is 0.3.
A rotating drum is braked by a flat belt attached to the lever ABC, hinge at B as shown in Figure. Determine the braking moment exerted by a vertical weight of 150 N. Take AB = 35 cm, BC = 65 cm and coefficient of friction between the belt and drum surface is 0.43. The radius of the drum is 0.2 m OPTIONS: 1.About 35 N-m 2.None 3.About 40 N-m 4.About 50 N-m 5.About 30 N-m 6.About 45 N-m