6.35. Model: We can assume the foot is a single particle in equilibrium under the combined effects of gravity, the tensions in the upper and lower sections of the traction rope, and the opposing traction force of the leg itself. We can also treat the hanging mass as a particle in equilibrium. Since the pulleys are frictionless, the tension is the same everywhere in the rope. Because all pulleys are in equilibrium, their net force is zero. So they do not contribute to T. Visualize:Solve: (a)From the free-body diagram for the mass, the tension in the rope is ()( )2G6 kg 9.80 m/s58.8 NTF mg== ==(b)Using Newton’s first law for the vertical direction on the pulley attached to the foot, ( )netGfootsinsin150 NyyFFTTFθ=Σ=−°−=Gfootfootsin15sin
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This note was uploaded on 12/10/2011 for the course PHYS 1211 taught by Professor Geller during the Fall '09 term at UGA.