A rigid body is said to be in translational equilibrium, if it remains at rest or moving with a constant velocity in a particular direction. For this, the net external force or vector sum of all the external forces acting on the body must be zero, i.e., `oversetrarr(F) = 0 or overset rarr(F) = sum overset rarr(F_(i)) = 0` If `U` is potential energy of the body, then `F = - (dU)/(dr) = 0 or U =` constant (max. or min.) When `U =` minimum, equilibrium of body is stable, When `U` tends to increase, equilibrium is unstable, When `U` remains constant, equilibrium is neutral. Read the above passage and answer the following questions : (i) When can a bosy moving uniformly along a straight line be in equilibrium ? What is this equlilbrium called ? (ii) What is the significance of `U =` minimum in day to day life ?

A rigid body is said to be in translational equilibrium, if it remains

1.	A rigid body is said to be in translational equilibrium, if it remains at rest or moving with a constant velocity in a particular direction. For this, the net external force or vector sum of all the external forces acting on the body must be zero, i.e., `oversetrarr(F) = 0 or overset rarr(F) = sum overset rarr(F_(i)) = 0` If `U` is potential energy of the body, then `F = - (dU)/(dr) = 0 or U =` constant (max. or min.) When `U =` minimum, equilibrium of body is stable, When `U` tends to increase, equilibrium is unstable, When `U` remains constant, equilibrium is neutral. Read the above passage and answer the following questions : (i) When can a bosy moving uniformly along a straight line be in equilibrium ? What is this equlilbrium called ? (ii) What is the significance of `U =` minimum in day to day life ?
Answer» (i) A body moving uniformly along a straight line is in equilibrium when vector sum of all the external forces acting on the body is zero. This equilibrium is called dynamic equilibrium. (ii) When `U =` minimum, i.e. potential energy of the body is minimum, the body is in stable equilibrium. In day to day life, stable equilibrium corresponds to peace of mind and potential energy `(U)` corresponds to your involvement. Thus when your involvement is minimum, you have peace of mind and stability.

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