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Our topic is on friction and what it is. So what is friction? Friction is the "evil" of all motion. No matter which direction an object moves in, friction will pull it the other way. Move something right, friction pulls it left. Move something up, friction pulls it down.
Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth. Although two objects might look smooth, microscopically, they're very rough and jagged. However, friction decreases with smoothness only to a certain degree. Friction actually increases between two extremely smooth surfaces because of increased attractive electrostatic forces between their atoms. Friction does not depend on the amount of surface area that are in contact between the moving bodies or on the relative speed of the bodies. What it does depend on though, is the magnitude of the forces holding the two bodies together. When a body is moving over a horizontal surface, it presses down against the surface with a force equal to its weight. An increase in the weight of the body creates more resistance, so there is more friction.
Friction is not all bad. It has a lot do with life as we know it on Earth. Without friction, we wouldn't be able to do a lot of the things that we need to do. So why do we need friction? It's friction that enables us to walk, among other things. Friction is what keeps one foot planted on the ground as the other one steps forward. Otherwise, without friction, the shift in weight would cause us to slide around. Also most braking systems use friction as their main component. When you squeeze the brakes on a 10-speed bike, a small rubber brake is pressed against both sides of the bike tire. The friction of the brake pad against the wheel causes the rotation of the wheel to slow down to a stop.
There are two types of friction, "static friction" and "kinetic friction". Static friction is the frictional force that is created when trying to put an object into motion when it is at rest. Kinetic friction is the frictional force that tends to slow a body down when it is in motion. In most cases, static friction is greater than kinetic friction. The force do to kinetic friction is generally proportional to the force applied. In that case, a "coefficient of friction" is the ratio of frictional force to the normal force on the object. Here is an example for kinetic friction I need to move a big cardboard box full of books from my garage to my car, which is on the driveway. I decide its easier to push the box than to pick it up. It works pretty well when I am on my garage floor. But when I get to the driveway, I have some problems. The box is really hard to push because the cement is so rough. I come up with an easy solution -- I decide to take some books out of the box. Now, I can make it to my car. Here is an example of static friction I decide to put twice as many books into my box, making it twice as heavy. This time, I can hardly make the box start moving, so I really have to lean into it. Once I finally get it to start moving, though, its not as hard to push.
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