Pinning force

Pinning force is like a game where you try to catch something that is moving really fast with your hands. Imagine you're trying to catch a butterfly flying around in the air. But butterflies are really fast and you can't catch them easily with just your hands.

So, what can you do? Well, you might try to trap the butterfly in a net or between your hands. This is kind of like how pinning force works. It's a way to trap something that is moving really fast in a certain place, like a pin holding something in place.

Think of a pin on a board. If you try to move the pin, it won't go anywhere. That's because the pin is holding it in place. The force of the pin is keeping the object from moving.

In other words, pinning force is the force that keeps an object in place by trapping it in one spot. It's kind of like a magic spell that keeps something from moving. And just like a magic spell, if you break the pin or the object, the pinning force will disappear and the object will be free to move again.