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AP Physics C: Mechanics
5.6 Newton’s Second Law in Rotational Form
5.4 Rotational Inertia
5.3 Torque
AdvancedMCQMathematicalConceptual18k
A horizontal rectangular bar representing a rod of length \(L\) and mass \(M\). The left end of the bar is attached to a fixed circular hinge mounted on a hatched support. A horizontal dimension line above the bar spans its full length and is labeled \(L\). A small solid dot marks the center of the bar, with a horizontal dimension line below spanning from the left end to the dot, labeled \(\dfrac{L}{2}\). No other labels, lines, text, or axes appear.
A uniform rod of length \(L\) and mass \(M\) pivoted at its left end.
A uniform thin rod of mass \(M\) and length \(L\) is attached to a frictionless horizontal pivot at its left end. The rod is held horizontally at rest and then released from rest at time \(t = 0\). Which of the following correctly describes the vertical force exerted by the pivot on the rod immediately after release, and provides the correct justification?

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