What is Friction?
Everyday we experience friction, it is necessary for us to walk or for the wheels on vehicles to turn and move.
So what is friction? How does it work?
Friction is defined as the resistance to motion between contacting surfaces. The effect of friction is dependent on the contacting surfaces and the material properties of the solids.
There are three rules to friction that should be discussed before we examine friction in more depth.
These are:
1.) Friction is independent of the surface area in contact.
2.) Friction is directly proportional to the load or the force pushing the surfaces together.
3.) Friction is independent of the sliding speed or the objects velocity.
One would think that the roughness of the surface or the size of the contact area matters in the amount of friction between objects. Rule two helps to explain why rule one is true.
Friction is dependent on the amount of force being exerted on the surface, which increases the surface area which in turn increases the friction.
The amount of force being exerted on the surface plays the major role and the speed or velocity of the object sliding plays a very secondary role.
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