A rolling object slows down and stops because friction and air resistance are working against it, like when you slide across a floor and eventually stop moving.
Imagine you're on a swing, you go back and forth smoothly at first, but after a while, you start to slow down. That’s because the air around you is pushing back slightly, and the chains of the swing also create friction, which makes it harder for you to keep swinging high.
What Are Friction and Air Resistance?
Friction is like when your shoes rub against the floor, it's a kind of pushback that happens when two things touch. If you roll a ball on the ground, the ball and the ground push back at each other, making the ball lose speed.
Air resistance is similar but happens in the air, as the object moves forward, the air around it tries to "catch up" and push against it, like when you run through wind. The faster something moves, the more air resistance it feels.
Together, these two forces are like a tired friend who keeps tugging on your sleeve while you're running, even if you start fast, eventually they make you slow down and stop.
Examples
- A ball rolls across the floor and gradually slows down until it stops.
- A toy car moves along a table but eventually stops because of friction.
- A wheel on a skateboard keeps moving but eventually comes to rest.