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Track and field rules state that a hurdle must be set to overturn when a certain magnitude of force (50 N) is applied horizontally to the top rail. Calculate the distance out along the arms from axis AB that the two 5.3 kg counterweights should be placed so that the hurdle will tip forward when the horizontal force to the top rail exceeds 50 N. Note: the two 5 N forces shown on the diagram indicate
the weights of the hurdle’s support arms.



50 N 1.1 m 0.30 m 5.3 kg 5.3 kg
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Answer #1

Hii

50N IVS.3K SN 5.3ke To just overturn the hurdle otorgy SON must overcome the torque of SN and weight. so Frug = 5.3x9.6 N 50X

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