Hello,Harshitha go through the paragraph given below so that you can get some basic idea about dynamic equilibrium,

Have you ever been stuck in traffic on a bridge between two cities and noticed that traffic in the other direction was flowing smoothly while your side was at a standstill? It's a bummer. What if traffic were flowing smoothly on both sides? Better yet, what if traffic were flowing at the same rate in both directions, causing the number of cars in both cities to remain constant? Well, when the rate of cars entering and leaving both cities is the same, and the net number of cars in each city is steady over time, the entire process is in a dynamic equilibrium.

Equilibrium occurs when a reversible reaction, a reaction that proceeds in both directions, has an unchanging ratio of products and reactants. The big picture of chemical equilibrium is static, as the concentration of products and reactants is constant. A closer look, however, reveals that equilibrium is actually a very dynamic process as the reaction is moving in both directions at an equal pace.

Dynamic equilibrium is an example of a steady state function. For a system in a steady state, presently observed behavior continues into the future. Therefore, once a reaction has reached equilibrium, the ratio of product and reactant concentrations will remain the same even as the reaction continues.

Hope it helps.

For chemistry, Dynamic equilibrium only occurs in reversible reactions, and it’s when the rate of the forward reaction is equal to the rate of the reverse reaction. These equations are dynamic because the forward and reverse reactions are still occurring, but the two rates are equal and unchanging, so they’re also at equilibrium

For physics consider a fan rotating. The net force is 0 therefore it is balanced. But it is also moving. So thats equilibrium in motion. Static is stationary. Dynamic is in motion.