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Which equation correctly relates torque to angular acceleration?

1. Torque equals mass times time squared divided by three.
2. Angular acceleration equals three times gravitational acceleration divided by twice the length.
3. Torque equals gravitational force multiplied by half the length.
4. Torque equals moment of inertia multiplied by angular acceleration.

Correct answer: Torque equals moment of inertia multiplied by angular acceleration.

Solution

The equation for angular momentum involves the relationship between torque (τ), moment of inertia (I), and angular acceleration (α). The correct expression is τ = Iα, which is the rotational analog of Newton's second law.

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