1 Introduction To Statics 2 Basic Operations With Force Systems 3 Resultants Of Force Systems 4 Coplanar Equilibrium Analysis 5 Three-dimensional Equilibrium 6 Beams And Cables 7 Dry Friction 8 Centroids And Distributed Loads 9 Moments And Products Of Inertia Of Areas 10 Virtual Work And Potential Energy Chapter7: Dry Friction
Chapter Questions Section: Chapter Questions
Problem 7.1P: Can the two blocks be in equilibrium in the position shown? Justify your answer. All surfaces are... Problem 7.2P: Determine the range of P for which the system of two blocks will be in equilibrium. Friction is... Problem 7.3P: Two identical chairs, each weighing 14 lb, are stacked as shown. The center of gravity of each chair... Problem 7.4P: The two homogeneous bars AB and BC are connected with a pin at B and placed between rough vertical... Problem 7.5P: The contact surface between the 36-lb block and 20-lb homogenous cylinder is frictionless. Can the... Problem 7.6P: The uniform bar AB of weight W is leaning against a vertical wall. The coefficient of static... Problem 7.7P: The center of gravity of the 50-kg spool is at G. A cable wound around the hub of the spool is... Problem 7.8P: The brake pads at C and D are pressed against the cylinder by the spring BF. The coefficient of... Problem 7.9P: The 200-lb homogenous cylinder of radius R is pushed up the incline by a cart. Determine the... Problem 7.10P: The rear-wheel-drive pickup truck, with its center of gravity at G, is to negotiate a bump from a... Problem 7.11P: Solve Prob. 7.10 assuming that the pick-up truck has front-wheel drive. Problem 7.12P: The 2-lb bar is pinned at A and rests on the 4-lb spool at B. Both bodies are homogenous. If the... Problem 7.13P: The horizontal force P acts on the rim of the homogeneous cylinder of radius R and weight W.... Problem 7.14P: The uniform bar and the homogeneous cylinder each have a mass of 24 kg. The static coefficient of... Problem 7.15P: A stepladder consisting of two legs pinned together at C is resting on a rough floor. Will a 170-lb... Problem 7.16P: The mass of the unbalanced disk is m, and its center of gravity is located at G. If the coefficient... Problem 7.17P: The two uniform sheets of plywood, each of length L and weight W, are propped as shown. If the... Problem 7.18P: Find the largest value of b/h at which the folding table is in equilibrium. The coefficients of... Problem 7.19P: The 3600-lb car with rear Wheel drive is attempting to tow the 4500-lb crate. The center of gravity... Problem 7.20P: The 3600-lb car with rear wheel drive is attempting to push the 4500-lb crate. The center of gravity... Problem 7.21P: The man is trying to push the homogeneous 20-kg ladder AB up a wall by applying the horizontal force... Problem 7.22P: A 1.1-kg disk A is placed on the inclined surface. The coefficient of static friction between the... Problem 7.23P: The 40-lb spool is suspended from the hanger GA and rests against a vertical wall. The center of... Problem 7.24P: A uniform plank is supported by a fixed support at A and a drum at B that rotates clockwise. The... Problem 7.25P: The uniform bar of weight W is supported by a ball-and-socket joint at A and rests against a... Problem 7.26P: The uniform plank is initially at rest on the fixed support at A and the stationary drum at B. If... Problem 7.27P: The two homogeneous bars with the weights shown are connected with a pin at B and suspended from a... Problem 7.28P: The man pushes the 120-lb homogeneous crate with the horizontal force P. Determine the largest... Problem 7.29P: The 80-kg crate has its center of gravity at G. Determine the smallest force P that will initiate... Problem 7.30P: Solve Prob. 7.29 if =0. Problem 7.31P: The 120-lb door with its center of gravity at G is hung from a horizontal track at A and B. Find the... Problem 7.32P: Determine the largest force P for which the 16-kg uniform bar remains in equilibrium. Problem 7.33P: Determine the largest angle for which the homogeneous block remains at rest. Problem 7.34P: The cylinder and the block are connected by a horizontal cord. Determine the largest couple C that... Problem 7.35P: The weight of the cylindrical tank is negligible in comparison to the weight of water it contains... Problem 7.36P: The coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find... Problem 7.37P: The two homogenous boxes are stacked vertically. Determine the smallest force P that would initiate... Problem 7.38P: Two concrete blocks weighing 320 lb each form part of the retaining wall of a swimming pool. Will... Problem 7.39P: Derive the expression for the largest angle ? for which the homogeneous block stays in equilibrium. Problem 7.40P: The 60-lb plank rests on a frictionless roller at A, and the 20-lb triangular support BD. Both... Problem 7.41P: The 2000-lb weight of the trailer is distributed equally between its two wheels, one on each side of... Problem 7.42P: Determine the smallest force P, applied to the plunger D, that will prevent the couple C=200Nm from... Problem 7.43P: The homogenous cylinder of weight W is at rest against a curb. Determine the smallest coeffient of... Problem 7.44P: The uniform bar of length L and weight W is kept in the horizontal position by friction. Determine... Problem 7.45P: The movable bracket of negligible weight is mounted on a vertical post. The coefficient of static... Problem 7.46P: The 200-lb man walks up the inclined plank of negligible weight. The coefficients of static friction... Problem 7.47P: Determine the smallest coefficient of static friction at A for which the system shown is... Problem 7.48P: Find the smallest distance d for which the hook will remain at rest when acted on by the force P.... Problem 7.49P Problem 7.50P: The block of weight W is pulled by the force P inclined at the angle to the horizontal. Find the... Problem 7.51P: The two 200-lb blocks are pushed apart by the 15 wedge of negligible weight. The angle of static... Problem 7.52P: Determine the smallest horizontal force P that must be applied to block B to cause impending motion.... Problem 7.53P: The device shown is used to measure the kinetic coefficient of friction between the rotating shaft S... Problem 7.54P: The single-threaded screw of the floor jack has a pitch of 0.5 in. and a mean radius of 1.75 in. The... Problem 7.55P: A wedge is used to prop up the 6000-lb block of marble. The wedge angle is =30, and the angle of... Problem 7.56P: The square-threaded screw 0f the C-clamp has a mean diameter of 8 mm and a pitch of 1.6 mm. The... Problem 7.57P: The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a... Problem 7.58P: The screw of the carjack has a pitch of 0.1 in. and a mean radius of 0.175 in. Note that the ends of... Problem 7.59P: How many turns of rope around the capstan are needed for the 40-lb force to resist the 8000-lb pull... Problem 7.60P: The force P applied to the brake handle enables the band brake to reduce the angular speed of a... Problem 7.61P Problem 7.62P: The 120-kg block A is suspended from a rope that runs around the fixed pegs B and C. The coefficient... Problem 7.63P: The leather rein used to fasten the horse to the hitching rail weighs 3.5 oz per foot. The... Problem 7.64P: The 30-lb weight is attached to a rope that runs over a fixed cylinder. The coefficient of static... Problem 7.65P: The rail AB of negligible weight is suspended from a rope that runs around two fixed pegs. The... Problem 7.66P: The blocks A and B of weights WA and WB are joined by a rope that passes over the fixed peg C. The... Problem 7.67P: The 150-lb weight is attached to a rope that passes over the fixed cylinders A and B. The... Problem 7.68P: The 50-lb homogeneous bar AB is suspended from a rope that runs over a small peg at C. The bar is... Problem 7.69P: The collar bearing carries the axial load P = 400 N. Assuming uniform pressure between the collar... Problem 7.70P: Solve Sample Problem 7.16 if the contact pressure under the polisher varies parabolically from p0 at... Problem 7.71P: The 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If... Problem 7.72P Problem 7.73P: The normal pressure acting on the disk of the sander is given by p=(4/3)+(r2/6), where p is the... Problem 7.74P Problem 7.75P: The single-plate clutch transmits the torque C from the input shaft on the left to the output shaft... Problem 7.76P: The clutch described in Prob. 7.75 is to transmit a torque of 120lbft when the total spring force... Problem 7.77P: The cone clutch transmits the torque C through a conical friction surface with cone angle . The... Problem 7.78P: The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016,... Problem 7.79P: The coefficient of rolling resistance between the 30-kg lawn roller and the ground is r=0.1. (a)... Problem 7.80P Problem 7.81P: Calculate the horizontal force P required to push the 85-lb lawn mower at constant speed. The center... Problem 7.82RP: The uniform pole BC of length L and weight W is placed on rough ground, supported by the rope AC.... Problem 7.83RP: The homogeneous bar AB of weight W and length L is lifted by the force P that is perpendicular to... Problem 7.84RP: Find the smallest angle for which the uniform crate can be tipped about corner A. Also compute the... Problem 7.85RP Problem 7.86RP: Determine the largest angle for which the uniform box can be in equilibrium. Problem 7.87RP: Can the uniform bar of weight W remain at rest in the position shown? Problem 7.88RP: The panel of weight W with its center of gravity at G is placed between vertical guides and... Problem 7.89RP: The woman is trying to move the crate of weight W by pulling on the rope at the angle to the... Problem 7.90RP: The screw of the clamp has a square thread of pitch 0.16 in. and a mean diameter of 0.6 in. The... Problem 7.91RP: Find the largest clockwise couple C that can be applied to cylinder A without causing motion. The... Problem 7.92RP: The test specimen AB is placed in the grip of a tension-testing machine and secured with a wedge.... Problem 7.93RP: The coefficient of static friction between the 5-kg block and the inclined plane is 0.32. Determine... Problem 7.94RP: The uniform bars AB and BC are connected with a pin at B and placed on a horizontal surface. The... Problem 7.79P: The coefficient of rolling resistance between the 30-kg lawn roller and the ground is r=0.1. (a)...
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A 3600 kg truck travelling east at enters an icy intersection and collides with a 2000 kg car travelling south at . They become coupled together in the collision . Draw a diagram showing the initial and final situations . Be sure to include vectors to represent the velocities and their components.
Quantities that have magnitude and direction but not position. Some examples of vectors are velocity, displacement, acceleration, and force. They are sometimes called Euclidean or spatial vectors.
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