Feel the force around you – Frictional force Part III
This is the third article in a series in order to explain the force of friction. Possibly, this is the most interesting article beside all related, which links could be find at the end of this one. This article gives an answer to the question why friction does exist. In this article we will skip all mathematical and physical background and focus on very simple examples. Friction does exist because the surface is not 100% smooth, and there is no such an object (including living beans) in nature with 100% smooth surface. That is the reason why friction does exist. But something should be clear, the frictional force is a reaction force, which means that it exist only when one object has tendencies to move, interacting with some other object (when two objects are connected) . On bellow picture we see two connected objects. Both objects has saw tooth surface. When these two objects are connected, nothing happens, but when the above object has tendency to move, driven by som...