The friction between two surfaces of the same material and often very high becau

Question

The friction between two surfaces of the same material and often very high because of the chemical bonds that are formed with more ease. struttare for this phenomenon in winter tires there are several small incisions that when driving on snowy street are filled with snow. In this way the friction with the road covered with snow governed coeffiecient of snow snow-snow = 0,4 instead of rubber-snow = 0,2 with a beneficial effects are normally on the road holding of the vehicle.......................... Calculates the difference of maximum speed at which you can deal with a curve of radius 20m thanks to this system.

Explanation / Answer

To go around the curve, friction supplies a centripetal force, so

mv2/r = mg (mass cancels)

Solving for v gives us

v = (gr)

v for snow-snow = [(.4)(9.8)(20)]

v = 8.85 m/s

v for rubber-snow = [(.2)(9.8)(20)]

v = 6.26 m/s

The difference between these two values is 8.85 - 6.26 = 2.59 m/s

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