# How Cars Use Friction

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There are two types of friction. They are static friction and kinetic friction. Static friction is the friction you have to overcome to make an object move and kinetic friction is friction that is happening while an object is in motion. An example of static friction is like trying to push a car down the road. It is harder to push from a stop than from a roll. An example of kinetic energy is like your tires on the pavement while you are driving down the road.

First, I want to explain how the brakes on your car use friction to stop. There are a few major components to the braking system. The major components are the pedal, cylinder, pivot point, brake caliper, brake pads, and rotors. The next thing I am going to tell you about is how the force you apply to the pedal is multiplied to make more force. The pedal is four times as far from the pivot point as the cylinder, so the force at the pedal will be increased by a factor of four. Also the diameter of the brake cylinder is three times the size of the pedal cylinder. This further multiplies the force by nine. Overall the system increases the force of your foot by a pressure of thirty-six. So if you pt ten pounds of pressure on the pedal, there is actually three hundred and sixty pounds applied to the rotor by the caliper. When the caliper pressure is applied it smashes the rotor with the brake pads. This creates friction between them. The more friction you have the faster you will stop. But it will also create a lot of