Question

A uniform rod is kept vertically on a horizontal smooth surface at a point $O$. If it is rotated slightly and released, it falls down on the horizontal surface. The lower end will remain :

• A. At $O$
• B. At a distance less than $l / 2$ from $O$
• C. At a distance $/ / 2$ from $O$
• D. At a distance larger than $1 / 2$ from $O$

Answer 1

Answer: (C)

As no external horizontal force is there on rod, its center of mass falls vertically so the lower end will be at a distance $l / 2$ from $O$ after it falls on ground.