3. Five identical keys are suspended from a balance, which is held horizontally as shown. The two keys on the left
are attached to the balance 6 centimeters from the pivot.

What will happen when the person lets go of the balance beam? Explain.

Explanation:

Let's say the mass of each key is m.

Sum the moments about the pivot.

∑τ = (2mg) (-0.06) + (3mg) (0.05)

∑τ = -0.12 mg + 0.15 mg

∑τ = 0.03 mg

Since the net torque is positive, the balance will rotate clockwise.

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