Question

There are three solids made up of aluminum, steel, and wood, of the same shape and same volume. Which of them would have the highest inertia?

• A. Steel
• B. Wood
• C. Aluminum
• D. None of these

Answer 1

The correct option is A

Steel

Moment of inertia

1. It is a calculated measure for a rigid body that is undergoing rotational motion around a fixed axis.
2. It measures how difficult it would be to change an object's current rotational speed.
3. We know that mass is the measure of the moment of inertia.
4. Out of these options, Steel has the highest density and hence highest mass.

Thus steel has the highest inertia.

Hence, option (A) Steel is correct.