Question

What is Mechanical equilibrium?

• A. When no mechanical work is done by one part of the system on any other part of the system.
• B. When no chemical work is done by one part of the system on any other part of the system.
• C. When mechanical work is done by one part of the system on any other part of the system.
• D. None of these

Answer 1

The correct option is A When no mechanical work is done by one part of the system on any other part of the system.

A system is said to be in mechanical equilibrium when no mechanical work is done by one part of the system on any other part of the system i.e. mechanical properties are uniform throughout the system. In classical mechanics, a particle is in mechanical equilibrium if the net force on that particle is zero

Hence, the correct option is $A$