Where did friction come from

The static friction coefficient is for surfaces that are not sliding, while kinetic is for sliding surfaces.The major cause of friction between.Coefficient of friction () a number typically between and that describes the roughness between two surfaces, where is slippery and is very rough.Tries to spin the wheel ccw and pushes against the car rightwards.Friction is the resistance of motion when one object rubs against another.The force of static friction is a force between two surfaces that prevents those surfaces from sliding or slipping across each other.

The earliest evidence for controlled use of fire outside of africa is at the lower paleolithic site of gesher benot ya'aqov in israel, where charred wood and seeds were recovered from a site dated 790,000 years old.Friction is a force that resists the motion of one object against another.These are called asperities, or.Sliding friction is the most common, but their is also fluid friction, between.Lee h of course, friction can also be essential in other mechanical applications, such as the friction between car tires and roads.The strength of the frictional force depends on many factors, including the mechanical properties, environment, interfacial layers, etc.

Because the molecules/particles have different heights above the surface it causes friction, i think.In contrast, sliding friction is the resistance created between any two objects when sliding against each other.Good question, i think it comes from the rigidness of the particles/molecules on the surface.