Question

what is cause of friction? Explain with the help of examples

Answer 1

two opposing forces acting on each other causes friction
for ex a football is moving on ground applying force on it in result of which ground apply force in opp. direction and friction arises

Answer 2

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The term sliding friction refers to the resistance created by two objects sliding against each other. This can also be calledkinetic friction. Sliding friction is intended to stop an object from moving. 

Understanding Sliding Friction

The amount of sliding friction created by objects is expressed as a coefficient which takes into consideration the various factors that can affect the level of friction. These various factors that can impact sliding friction include the following:

The surface deformation of objectsThe roughness/smoothness of the surface of the objeectsThe original speed of either objectThe size of objectThe amount of pressure on either objectThe adhesion of the surface