[ \sum F_x = 0, \quad \sum F_y = 0, \quad \sum \tau = 0 ]
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Then her insight: “The man’s weight moves up. The point of slipping starts at the bottom rung. So the condition changes from ( f_{\text{max}} ) to actual ( f(x) ).” [ \sum F_x = 0, \quad \sum F_y



