Question

Define equilibrium of motion. Write the equations for equilibrium.

Answer 1

Equilibrium A body is said to be inequilibrium if it is at rest or moving with uniform velocity. ... Newton's First Law of Motion: If the resultant force on a particle is zero, the particle will remain at rest or will continue at constant speed in a straight line.
http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch16/equilib.php

Answer 2

equation :

sum of anticlockwise moments =sum of clockwise moments.

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