State what two kinds of coefficients of friction exist. Describe the conditions

Question

State what two kinds of coefficients of friction exist. Describe the conditions under which each kind is appropriate. static function kinetic function Suppose a block of mass 25 - 0 kg rests on a horizontal plane, and the coefficient of static friction between the surfaces is 0.220. What is the maximum static frictional force that could act on the block? Show your work. _N What is the actual static function force that acts on the block if an external force of 25 - 0 N acts horizontally on the block? _N In the experiment to measure the coefficient of kinetic friction by sliding a block down an inclined plane, it is required that the block move at constant velocity. Why

Explanation / Answer

(a)

Maximum frictional force that could act = mg = 0.220 x 25 x 9.8 = 53.9 N

(b)

When external force is 25 N, frictional force is also 25 N

This is because Friction is a self-adjusting force and it always adjusts itself to sufficient force that can oppose the incident external force. But if that force is greater than the maximum, the frictional force will be equal to that maximum.

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