Here's why:
* Static Friction: This is the force that prevents an object from moving when a force is applied to it. It's like an invisible glue holding the object in place. The amount of static friction depends on the surface's roughness and the force pushing against it.
* Kinetic Friction: This friction occurs when an object is already in motion. It's generally less than static friction.
To put it simply: It takes more force to overcome static friction and get an object moving than it does to keep it moving once it's already in motion.
