# 18SpheroFrictionLab.docx - Understanding Friction...

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Understanding FrictionIntroductionAccording to the Physics Classroom,the frictional force is exerted by a surface as an objectmoves across it or makes an effort to move across it. There are at least two types of frictionforce - sliding and static friction. Though it is not always the case, the friction force oftenopposes the motion of an object. For example, if a book slides across the surface of a desk,then the desk exerts a friction force in the opposite direction of its motion. Friction resultsfrom the two surfaces being pressed together closely, causing intermolecular attractiveforces between molecules of different surfaces. As such, friction depends upon the nature ofthe two surfaces and upon the degree to which they are pressed together. The maximumamount of friction force that a surface can exert upon an object can be calculated using theformula below:fs<μsNfk=μkNRecall that these relationships can be represented graphically, as shown below.ObjectivesDetermine the coefficient of kinetic friction between the Sphero and an underlyingsurface.

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