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For full equilibrium, alongside zero net force, what else must be zero?
AThe total charge
BThe net torque
CThe total mass
DThe total volume
Answer & Solution
Correct answer: B. The net torque
1. Balance requires both translation and rotation to be settled.
2. The net external force must be zero.
3. The net torque must also be zero.
4. Together those two statements define equilibrium.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 9 'Statics and Torque', sections 9.1-9.5_
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