8 Determine the minimum horizontal force P required to hold the crate from sliding down the plane. The crate has a mass of 100 kg and the coefficient of static friction between the crate and the plane is µ, =0.25 30° 9..Determine the minimum force P required to push the crate up the plane. The crate has a mass of 50 kg and the coefficient of static friction between the crate and the plane is us =0.25.

8 Determine the minimum horizontal force P required to hold the crate from sliding down the plane. The crate has a mass of 100 kg and the coefficient of static friction between the crate and the plane is µ, =0.25 30° 9..Determine the minimum force P required to push the crate up the plane. The crate has a mass of 50 kg and the coefficient of static friction between the crate and the plane is us =0.25.

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 7.63P: The leather rein used to fasten the horse to the hitching rail weighs 3.5 oz per foot. The...

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The square-threaded screw 0f the C-clamp has a mean diameter of 8 mm and a pitch of 1.6 mm. The coefficient of static friction between the threads is 0.2. If the torque C=1.50Nm is used to tighten the clamp, determine (a) the clamping force; and (b) the torque required to loosen the clamp.
The screw of the clamp has a square thread of pitch 0.16 in. and a mean diameter of 0.6 in. The coefficient of static friction between the threads is 0.4. Determine (a) the torque C0 that must be applied to the screw in order to produce a 28-lb clamping force at A; and (b) the torque required to loosen the clamp.
The single-plate clutch transmits the torque C from the input shaft on the left to the output shaft on the right. Compression springs between the clutch housing and the pressure plate provide the necessary pressure on the friction surface. The splines prevent the clutch plate from rotating relative to the output shaft. If Ri=4 in. and R0=9 in., determine the total force that must be applied to the pressure plate by the springs if the clutch is to transmit a torque of C=56lbft when it is new.
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 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?
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.
roll of paper has a uniform weight of 2kN and is suspended from the wire hanger so that it rests against the wall. If the hanger has a negligible weight and the bearing at O can be considered frictionless, determine the force P needed to start turning the roll if = 30°. The coefficient of static friction between the wall ܬܐ and the paper is µ = 0.3.
Boxes A and B are connected by means of a cable and are placed on a inclined plane. If the quotation angle has a value of 18º for when the boxes start to slide, determine the weight of the box A and if the weight of B is 200 ??. Coefficients of static friction between the boxes and the inclined plane are respectively 0.20 and 0.40.
The crate in Figure 3.7 has a mass 350 kg and is subjected to a towing force P acting at an angle θ1 = 20° with the horizontal. If the coefficient of static friction is 5, determine the magnitude of P to just start the crate moving down the plane. θ2 = 10° answer=986.61N
If each box weighs 150 lb, determine the least horizontal force P that the man must exert on the top box in order to cause motion. The coefficient of static friction between the boxes is μs = 0.54, and the coefficient of static friction between the box and the floor is μ's = 0.24.
The drum has a weight of 110 lb and rests on the floor for which the coefficient of static friction is μs = 0.30. Assume the center of gravity of the drum is located at its center. Pt. A : If a = 3 ft and b = 4 ft, determine the smallest magnitude of the force P that will cause the drum to start sliding. Pt. B: If a = 3 ft and b = 4 ft, determine the smallest magnitude of the force P that will cause the drum to start tipping. Pt. C : Based on the results in the previous two parts, the impending motion of the drum is.... Slipping or Tipping?
Two bodies is connected in point C, are supported by rigid underlay at an angle α. F is the force acting on right body. We are considering the weight of bodies G and the friction between the bodies and the underlay. Length of bodies l=2000mm.    G1= 160 N, G2= 180 N, α = 30° Find:  1.) Find the magnitude of the force so that it slips on the underlay 2.) Draw the dependence of the force F as a function of the coefficient of friction f (in the range 0-0.5)