Question

A uniform bar of square cross-section is lying along a frictionless horizontal surface. A horizontal force is applied to pull it from one of its ends, then

• A. the bar is under same stress throughout its length
• B. the bar is not under any stress because force has been applied only at one end
• C. the bar simply moves without any stress in it
• D. the stress developed gradually reduces to zero at the end of the bar where no force is applied

Answer 1

Answer: (D)

When a horizontal force is applied on uniform bar to pull it, then an acceleration is produced in the each cross-section of rod. Hence, each section of rod experiences a tension which is zero at other end. Therefore, stress in the rod developed gradually reduces to zero at the end of the bar where no force is applied.