Question

Which type of motion does a rigid body undergo about a fixed axis?

• A. Translational
• B. Rotational
• C. Elliptical
• D. Random

Hint:

Types of Motion. Translation: All points move parallel. Rotation about fixed axis: All points move in circles around the axis. General plane motion: Combination of translation and rotation.

Answer 1

The Correct Option is B

When a rigid body moves about a fixed axis, all points in the body move in circles centered on that axis, and all points experience the same angular displacement, angular velocity, and angular acceleration at any given instant.
This type of motion, where the body turns around a fixed axis, is defined as rotational motion.
Translational motion involves all points moving along parallel paths (linear or curvilinear).
Elliptical motion describes the path of an object moving in an ellipse (like planets).
Random motion implies unpredictable movement.
Motion about a fixed axis is pure rotation.