Slide 1
Problem 8-107
TJ Arnot & Russell Roman1. Draw Free Body Diagram2. Set Up Equilibrium Equation3. Solve for Component Tensions4. Solve Frictional Analysis EquationsApproach
Problem Statement: The drive pulley B in a video tape recorder is on the verge of slipping when it is subjected to a torque of M = 0.005 N*m. If the coefficient of static friction between the tape and the drive wheel and between the tape and the fixed shafts A and C is s = 0.1, determine the tensions T1 and T2 developed in the tape for equilibrium.Free Body DiagramT1T2T3T4.01 m.01 m.01 mM = .005 N*mACB
Equilibrium EquationEquilibrium equation for pulley B.
T3T4.01 mM = .005 N*mB
Solve.Frictional AnalysisT3 opposes the direction of motion.T1T3.01 mA
Frictional AnalysisT2 opposes the direction of motion.T2T4.01 mC
Answer