Torque & Equilibrium Video Lessons

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Problem: Suppose that a meter stick is balanced at its center. A 0.18 kg mass is then positioned at the 8-cm mark. At what cm mark must a 0.22 kg mass be placed to balance the 0.18 kg mass?

FREE Expert Solution

Use proportionality. Calculate torques about fulcrum:

τ1 = τ2

m1gr1 = m2gr2

m1r1 = m2r2

Can use cm instead of converting to m because final answer should be in cm:

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Problem Details

Suppose that a meter stick is balanced at its center. A 0.18 kg mass is then positioned at the 8-cm mark. At what cm mark must a 0.22 kg mass be placed to balance the 0.18 kg mass?

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