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06_P31InstructorSolution

06_P31InstructorSolution - 6.31 Model Visualize Solve The...

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6.31. Model: The piano is in static equilibrium and is to be treated as a particle. Visualize: Solve: (a) Based on the free-body diagram, Newton’s second law is ( ) ( ) net 1 2 2 2 1 1 net 1 2 3 G 3 1 1 2 2 0 N cos cos 0 N sin sin x x x y y y y y F T T T T F T T T F T T T mg θ θ θ θ = = + = = = + + + = Notice how the force components all appear in the second law with plus signs because we are adding forces. The negative signs appear only when we
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