The wheel shown supports a load of 500 lb. The hub fits loosely over an axle of diameter 1.3 in and turns with a coefficient of friction of 0.15. The moment required to overcome friction in the journal bearing at the hub is best given by
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- The weight of the wheel is 100 Newtons (with mass uniformly distributed). The static coefficient of friction between the wheel and the surface is ls = 0.35. A couple-moment, M, is applied to the wheel in the direction shown. Part One: Draw the FBD of the wheel. (Alternatively, you may draw the FBD of the wheel/link- AB as a single, combined object.) You may NOT use the given existing figure. (Hint: Taken in isolation, the link-AB is a two-force member.) Part Two: Write the equations of equilibrium, and at the point of impending motion (slipping), calculate: a) The minimum applied couple Mmin that is required to initiate slipping (in Newton-meters) b) The maximum friction force, Fmax (in Newtons). c) The normal force, N (in Newtons) of the surface on the wheel (in Newtons). d) The force of the link-AB on the wheel, FAB (in Newtons). B 150 mm M 250 mm AThe band brake of Fig. is used to control the rotation of a drum. The coefficient of friction between the belt and the 40 V-pulley is 0.10. The weight of the handle is 2 lb. If a force of 50 lb is applied to the end of the han- dle, determine the maximum torque for which no motion occurs if the torque is applied Counterclockwise. 50 Ib 3 in. +9 in- 18 in.-ago D The thin rod has a weight W = 49.05 N applied at its center of gravity and rests against the rough floor and smooth wall. The coefficient of static friction at 'A' is HA = 0.25. Assume impending motion at 'A', What would be the friction force at "A': Select one: O a. 49.05 N O b. 5 N c. 24.52 N O d. 12.26 N
- The mass center of the rear-engine 1530-Kg car is at G. The coefficient of static friction is 0.5 at driving tire/road interfaces. 600'mm 1500 1500 mm mmArm ABC is connected by pins to a collar at Band to crank CD at C. Neglect the effect of friction. 160 mm 90 mm A 180 mm B M 320 mm D 125 mm 300 mm Draw the free-body diagram of the member ABC and CD.Form the figure shown, a flexible belt placed around a rotating drum of 4-inch radius acts as a brake when the arm ABCD is pulled down by the force P. The coefficient of kinetic friction between the belt and the drum is 0.7. What force P that would result in a braking torque of 400 lb . in., assuming that the drum is rotating Neglect the weight of the counterclockwise. brake arm. 60° 4 in. 60° A B C -2 in.²4in. 2 in. 42×-| -2 D P
- A 2000-lb bike with a rear wheel drive has awheelbase of 10 ft. The c.g. is 3 ft above thepavement and 4 ft ahead of the rear wheels.The coefficient of friction is 0.60 between thetires and the pavement. Determine the inertia force on themotorcycle when the acceleration ismaximum.a. 2846.57 lbs b. 2675.66 lbsc. 2864.75 lbs d. 2666.75 lbsProblem 4. A.) If the uniform concrete block has a mass of 500 kg, determine the smallest horizontal force P needed to movethe wedge to the left. The coefficient of static friction between the wedge and the concrete and the wedge and the floor is 0.3. The coefficient of static friction between the concrete and floor is 0.5.ANSWER: P=1797.52; N=1.80kNB.)Refer to problem number 4. Calculate the followinga.) the angle of friction between the wedge and the concrete and the wedge and the floor.Answer: ?????? ??? ????????= ?????? ??? ?????= 16.7ob.) the coefficient of static friction between the concrete and floor.Answer: ????????? ??? ?????= 263.56o13 cm 50 cm 2. The disk weighs 220 N and the bar weighs 110 N. The coefficients of friction between the disk and the
- The coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find the smallest angle and the corresponding force P that would initiate simultaneous tipping and sliding of the bar.A car has hydraulically operated disc brakes at the front and drum brakes at the rear. The frontbrakes have pistons of 58 mm diameter each, whereas each of the wheel cylinder at the rearbrake has 28 mm diameter. The master cylinder piston has diameter of 40 mm. The brake footpedal has a leverage of 4. If the brake pedal is applied a force of 100 N, Calculate (i) The brakingforce on the front axle, (ii) The braking force on the rear axle.An 800 N-m couple is applied to the flywheel asshown. The coefficient of belt friction is 0.20. Theminimum force P required to prevent rotation of theflywheel is applied.a.) Which Tension is larger, TA or TB? Explainb.) What is the angle of contact in radians?c.) What is the value of the ratio TA/TB? show fbd AND COMPLETE SOLUTION