The free body diagram below represents a 1 500 kg car sitting on a 3 000 kg bridge supported at its far ends. The car's position is three quarters of the length L from the left end of the bridge. Identify the one error in the torque equation below: A) never produces a torque on the bridge no matter where the axis of rotation is placed. B) never produces a torque on the bridge no matter where the axis of rotation is placed. C) cannot produce a torque on the bridge no matter where the axis of rotation is taken since it is at the center of the bridge. D) Because the perpendicular distance to from the left end of the bridge is 0, F₁L should be 0. E) Because the perpendicular distance to from the right end of the bridge is 0, F₂L should be 0.

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Quizplus · Accepted Answer

The error in the torque equation is that F₁L is not equal to 0, as the perpendicular distance to 11eb6adc_ee9f_2b5b_b0cf_614c365ee64e_TB8245_11 from the left end of the bridge is not 0. Therefore, choice D is the correct answer. Choice A and B are incorrect because they state that a certain force never produces a torque, which is a generalization and not necessarily true. Choice C is incorrect because the force at the center of the bridge can produce torque depending on the axis of rotation. Choice E is incorrect because the perpendicular distance to the force at the right end of the bridge is not 0, so F₂L should not be 0.

The Free Body Diagram Below Represents a 1 500 Kg