Friction makes it possible for us to drive safely and efficiently. Friction also cause heat when two objects rub against each other and that keeps our hands warm in the winter when we are waiting for the bus to come (Webster). If there were no friction, life would probably be a lot more complicated and probably would need special devices to do basic things. .
There are two basic types of friction. One type of friction is called static friction, which is represented by the symbol Fs. This force of friction is present when there is no sliding between the two surfaces that are in contact with each other (ScienceWorld.com). When you are pushing a really heavy object, that friction opposing your motion is called static friction. Static friction is present until you get the object moving. After you get the object to move, a second type of friction kicks in. This type of friction is called kinetic friction. Kinetic friction is present when an object is sliding across a surface (ScienceWorld.com). When you push an object, the force of friction is constant and you do not need to apply as much force to keep the object moving. When you stop applying force on the object, friction causes the object to stop.
However, there are also other types of friction: rolling and fluid friction. Rolling friction deals with the movement of circular objects, such as wheels. When wheels move, they roll, and it is during movement that there is friction, only at the point of contact with the ground. It is because of friction that wheels can roll, otherwise they would simply slide along the surface (Ron Kurtus "Force of Friction"). Rolling friction is very important and a major factor in making automobile tires. .
Another type of friction is fluid friction, or also known as fluid resistance. The friction of that fluid on the surface also affects an object that is moving through the air, water or other fluid.
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