Question

Define virtual displacement? explain the principle of virtual work?​

Answer 1

Principle of virtual work: ... - Theprinciple of virtual work is redated with equilibrium of bodies, and may be stated as follows: “ If a system in equilibrium under the action of a set of forces is given a virtual displacement, the virtual workdone by the forces will be zero.”

Answer 2

A virtual displacement means an instantaneous change in coordinates (a real displacement would require finite time during which particles might move and forces might change).