What do the types of frition do?

There are two main types of friction: static friction and kinetic friction.

* Static friction is the force that opposes the motion of an object that is at rest. For example, when you try to push a heavy object, the static friction between the object and the ground prevents it from moving. The amount of static friction depends on the weight of the object and the roughness of the surface.

* Kinetic friction is the force that opposes the motion of an object that is already in motion. For example, when you slide a book across a table, the kinetic friction between the book and the table slows it down. The amount of kinetic friction also depends on the weight of the object and the roughness of the surface.

Friction is a necessary force in everyday life. It allows us to walk, drive, and lift objects. However, too much friction can also be a problem. For example, friction between moving parts in a machine can cause the machine to overheat and break down.