There are two main types of friction:
* Static friction: This acts on objects at rest, preventing them from moving when a force is applied. It's the force you need to overcome to get an object moving.
* Kinetic friction: This acts on objects in motion, opposing their movement. It's the force that makes things slow down or stop moving.
Friction is a result of the microscopic irregularities on the surfaces of the objects. These irregularities interlock and create resistance to motion.
