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AP Physics 1
5.5 Rotational Equilibrium and Newton’s First Law in Rotational Form
2.7 Kinetic and Static Friction
2.5 Newton’s Second Law
2.2 Forces and Free-Body Diagrams
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Assume the posts in the two figures are the same and they have a mass of \( 24 \) \( \text{kg} \) and a length \( L \). Both posts are held vertical by cables attached to the ground and making an angle of \( 36.9^\circ \) with the ground and with the pole, respectively. Both posts are pulled by horizontal forces \( F \). The post on the left is hinged at its lower end and the cable is attached at \( 3/5 \) of the post height from the ground. The post on the right rests on a horizontal surface with a static coefficient of friction \( 0.3 \) and the force is applied at \( 3/5 \) of the height from the ground.

Note: \( \sin 36.9 = 0.6 = 3/5 \); \( \cos 36.9 = 0.8 \).

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