Static Equilibrium and Dynamic Equilibrium | Physics |

This lecture is about static equilibrium and dynamic equilibrium.

Q: What is static equilibrium in physics?
Ans: A body is said to be in static equilibrium if it satisfies two conditions.
1) The translational velocity and rotational velocity of the object must be zero.
2) The net force acting on an object must be zero.
For example, consider some books lying on a table. These books neither move in straight or curved path; their translational velocity is zero. Also, these books don't move in a cyclic path; their rotational velocity is also zero.
Secondly, the net force acting on these books are also zero.
So these books are in static equilibrium.

Q: What is dynamic equilibrium in physics?
Ans: A body is said to be in dynamic equilibrium if it satisfies two conditions.
1) Either the translational velocity or rotational velocity of the object exist, but must not be zero.
2) The net force acting on an object must be zero.
For example, consider the motion of the earth.
The earth revolves around the sun with constant speed.
Secondly, the net force acting on the earth is also zero.
So, the earth is in dynamic equilibrium.

To learn more about static equilibrium and dynamic equilibrium, watch this lecture till the end.

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