Okay, imagine you have a big box of toys. Each toy is special and can do something different, like make noise or light up. Now, imagine sorting all the toys into groups based on what they can do. One group might have toys that light up, another group might have toys that make noise, and so on.
Those groups are like "factors" that show what the toys have in common. And when we say "dynamic factor," we mean that the groups can change over time. Sometimes the toys that light up might be in one group, but later they might be in a different group with other toys that move or have buttons.
This happens because the toys can be used in different ways, and sometimes we want to group them based on those different ways. It's like organizing your room - you might put your clothes in one drawer, but later decide to move them to a different drawer with your socks and underwear.
So when we talk about dynamic factors, we mean the different ways we group things based on what they have in common, and how those groups might change over time depending on how we use them.