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Problem 8-107 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 μs = 0.1, determine the tensions T1 andT2 developed in the tape for equilibrium. Approach 1. Draw Free Body Diagram 2. Set Up Equilibrium Equation 3. Solve for Component Tensions 4. Solve Frictional Analysis Equations TJ Arnot & Russell Roman
Free Body Diagram A T1 .01 m T3 M = .005 N*m .01 m B T4 .01 m C T2
Equilibrium Equation Equilibrium equation for pulley B. T3 M = .005 N*m .01 m Solve. B T4
Frictional Analysis A T3 opposes the direction of motion. T1 .01 m T3
Frictional Analysis T2 opposes the direction of motion. T4 .01 m C T2