Choose the correct value of coefficient of friction for the following data Friction force = 30 N Normal Force = 40 N О а. 1.25 O b. 0.5 O c. 0.25 O d. 0.75
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- The coefficient of static friction under the block a and b are the same. If the block is in the verge of sliding, find the tension at each chord. Assume that the pulley is frictionless.Recall [from Physics]:?? = ???Where:?? - is the frictional force?? - is the normal force? -coefficient of static frictiona. Determine the tensile force (lb) on the cable 1.b. Determine the tensile force (lb) on the cable 2. Plsss show complete handwritten solution. Thanksss!!2. A square threaded screw of mean diameter 25 mm and pitch of thread 6 mm is utilised to lift a weight of 10 kN by a horizontal force applied at the circumference of the screw. Find the magnitude of the [Ans. 966 N] force if the coefficient of friction between the nut and screw is 0.02. A bolt with a squore threaded screw has mean diameter of 25 mm and a nitch of 23 mm It carries anA friction sample is placed on a test ramp that pivots about Point O. When the end of the ramp is lifted to h = 1.2 ft the sample just begins to slide. With L = 3.5 ft, the coefficient of static friction is best given by a. 0.286 b. 0.481 c. 0.365 d. 0.181 O L -W h
- The coefficients of friction between the block ana the rail are us= 0.25 and uk= 0.20. Given: P2 = 200 N. P1 350 P2 Find the magnitude and direction of the smallest force P1 required to start the block moving up the rail. (You must provide an answer before moving on to the next part.) The magnitude and direction of the smallest force P1 required to start the block moving up the rail is °. N v (Click to select)PROBLEM: A 200N block is at rest on a 30° incline. The coefficient of friction between the block and the incline is 0.20. Compute the value of a horizontal force P that will cause motion to impend up the incline. |W 200N 30 F=uN 30 30Let the applied force on wedge B be: F1 = 3450 lb. Let the angle between the wedges be: 0 = 14°. Let the coefficient of static friction between A and C, and between B and D be: AC = = "BD Let the coefficient of static friction between A and B be: μAB = 0.5. P 0 I A F₁ с B Determine the minimum required force that is required to pull out the wedge: P = = 0.15. lb. D CC
- Blocks A and B have a mass MA and MB, respectively. If the coefficient of static friction between A and B and between B and Cis ps and between the ropes and the pegs D and E ps, determine the smallest force F needed to cause motion of block B . Units Used: kN =103 N Given: ?=45deg s =0.25 MA =100 kg ps = 0.5 MB =150 kg P=30N g=9.81m/s2The crate has a weight of 490 lb and a center of gravity at G rests on the floor for which the coefficient of static friction is equal to 0.35. If the force P = 300 lb is applied as shown in the figure below. The static friction force developed between the crate and the ground is. -2 ft. 2 ft -2 ft- 2 ft 4 ft 3 ft A Figure 1 Select one: O a. 234.5-Ib O b. 300-lb O c. 240-lb O d. 610 lb 3.3. For the figure shown below, if the coefficient of friction at the wall is 0.3, determine the coefficient of friction at the floor. Nw 3m 80kg Nw- Normal force at the wall Fw-Frictional force at the wall N,- Normal force at the wall F,-Frictional force at the wall 3m 30kg FF. NF 40°
- Q1 Q5) Determine the principal dimensions of a cone clutch faced with lather to transmit 40 kW at 800 r.p.m. from an electric motor to an air compressor. Sketch a sectional front view of the clutch and provide the main dimensions. Assume that the semi-angle of the cone is 10°, the coefficient of friction is 0.3, mean diameter of cone is (7-10)d, where d is the diameter of the shaft, allowable normal pressure for lather and cast iron is 0.1 to 0.2 N/mm, shear stress 100 N/mm, load factor is 2 and the mean diameter to face width ratio is 6.1. From the rotating shaft shown below, a force 100 N was pulled to reduce the shaft's angular speed through its cables. What is the maximum cable tension if the shaft rotates in a counterclockwise direction? Use coefficient of friction on shaft equal to 0.2. 200 300 Pz 100NA lever brake system is used to keep a wheel with an applied moment from moving. If the coefficient of static friction is Hs = 0.35 and the dimensions are as given in the parameter table, find the minimum force P that will keep the wheel from moving. BI A Mo value units parameter L1 L2 L3 400 mm 390 mm 30 mm r 140 mm Мо 450 N-m Р-