Why is there a need of second condition for equilibrium if a body satisfies first conditions for equilibrium?
Answers
Explanation:
The second condition necessary to achieve equilibrium involves avoiding accelerated rotation (maintaining a constant angular velocity ). A rotating body or system can be in equilibrium if its rate of rotation is constant and remains unchanged by the forces acting on it.
A body is said to be in equilibrium if no net force acts on it.”Newton’s first law of motion tells us that a body continues its state of rest or of uniform motion in a straight line if no resultant or net force acts on it. For example, a book lying on a table or a picture hanging on a wall is at rest. The weight of the book acting downward is balanced by the upward reaction of the table.
In the case of objects moving with uniform velocity, the resultant force acting on a leveled road and an airplane flying in the air with uniform velocity are the examples of bodies in equilibrium.
First condition for equilibrium does not ensure that a body is in equilibrium. In first condition of equilibrium, we deal with linear forces while in the second condition of equilibrium, we deal with rotational forces. The second condition necessary to achieve equilibrium involves avoiding accelerated rotation and helps to maintains a constant angular velocity.