AP Physics C Mechanics Quiz
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TORQUE AND ROTATIONAL DYNAMICS
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A seesaw pivots at its center and stays level while two students sit on opposite sides. A 300 N300\,\text{N} student sits 1.2 m1.2\,\text{m} to the left of the pivot, and a second student sits to the right with an unknown weight WW at a distance 0.80 m0.80\,\text{m}. The forces act vertically downward at their seats, creating torques with lever arms measured from the pivot. The support force at the pivot produces no torque about the pivot. The seesaw is motionless, so Newton's First Law in rotational form requires ∑τpivot=0\sum \tau_{\text{pivot}}=0. Considering the forces acting on the seesaw, calculate the force needed at a specific point to maintain equilibrium.
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