Does the pivot point (i.e., the triangle inthe diagram upon which the ruler bala

Question

Does the pivot point (i.e., the triangle inthe diagram upon which the ruler balances) exert a force on theruler? Does it exert a nonzero torque about the pivot? Does the pivot point (i.e., the triangle inthe diagram upon which the ruler balances) exert a force on theruler? Does it exert a nonzero torque about the pivot? Acentimeter ruler,balanced at its center point, has two coins placed on it, as shownin the figure. One coin, of mass, is placed at the zero mark; the other, of unknownmass, is placed at the 4.7 mark. The center of the ruler is at the 3.0 mark. The ruler is in equilibrium; it is perfectlybalanced. Does the pivot point (i.e., the triangle inthe diagram upon which the ruler balances) exert a force on theruler? Does it exert a nonzero torque about the pivot?

Explanation / Answer

Note that the weight of the ruler itself also does not exert a torque with respect to the pivot point since the rule is uniform and is pivoted at its midpoint.

Part B

Although the pivot exerts a force on the ruler it does not exert a torque with respect to the pivot point. Because the distance from the exerted force to the pivot is zero. And since torque is force multiplied by distance, the torque comes out to be zero if the distance is zero

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