When does an elastic metal rod change its length?

Question

When does an elastic metal rod change its length? (A) if it fall verrtically under its weight (B) If it is pulled along its length by a force acting at one end (C) If it is rotated about an axis at one end (D) If it sides on a smooth surface

Tardigrade Admin · Accepted Answer

An elastic metal rod will change its length when it is pulled along its length by a force acting at one end or rotates about an axis at one end. Since, deforming force exceeds the elastic limit.

Q. When does an elastic metal rod change its length?

if it fall verrtically under its weight

If it is pulled along its length by a force acting at one end

If it is rotated about an axis at one end

If it sides on a smooth surface

An elastic metal rod will change its length when it is pulled along its length by a force acting at one end or rotates about an axis at one end. Since, deforming force exceeds the elastic limit.