Equilibrium
Whenever a number of forces act on a body, they may change its linear velocity or angular velocity or both. If the combined effect of the forces acting on a body does not produce any change in its linear velocity and angular velocity, the body is said to be in equilibrium. Hence by complete equilibrium we mean Zero Linear Acceleration and Zero Angular Acceleration. It is not necessary that a body in equilibrium may be in position of rest.
Examples of Equilibrium
1) A Ball at Rest on a Hand
if the ball is placed on hand then two forces are acting on the bail. First is the force of gravity which is acting downward. Second is an equal force applied by the hand in the upward direction? As the ball is at rest; so these forces will balance each other. Hence the ball is in equilibrium because upward force must
be equal to downward force.
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