When force is applied to an object but it doesn't move, it's called static friction. This type of friction acts as a counterforce that prevents the object from moving, and it's equal and opposite to the applied force.

Here's a breakdown:

* Static friction is the friction that exists between two surfaces that are at rest relative to each other.

* Kinetic friction is the friction that exists between two surfaces that are in motion relative to each other.

Think of it like this:

* Static friction is like the friction you experience when you try to push a heavy box. As long as you don't apply enough force, the box won't budge.

* Kinetic friction is the friction you experience when the box is actually moving. Once the box starts moving, it takes less force to keep it moving at a constant velocity because you're overcoming the force of kinetic friction instead of static friction.

Let me know if you have any more questions!