First slide

Elastic behaviour of solids

Question

In the figure shown, forces of equal magnitude are applied to the two ends of a uniform rod. Consider A as the cross sectional area of the rod. For this situation, mark out the incorrect statements.

Easy

A

The rod is in compressive stress.
B

The numerical value of stress developed in the rod is equal to F/A.
C

The stress is defined as internal force developed at any cross section per unit area.
D

none of the above.

Solution

All of the statements are factual statements. Stress is defined as internal force developed in the system per unit cross-sectional area and is not defined as force applied per unit cross-section area, although in equilibrium, stress is numerically equal to applied force per unit area.

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