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Static Friction

why does the ...

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why does the value of friction goes up very to very high values if the surface is ultrasmooth?

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Q. An insect crawls up a hemispherical surface very slowly (figure). The coefficient of friction between the insect and the surface is

\frac{1}{3}

. If the line joining the centre of hemispherical surface to the insect makes an angle

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Q. An insect crawls up a hemispherical surface very slowly, figure. The coefficient of friction between the insect and the surface is

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Q. An insect crawls up a hemispherical surface very slowly. The coefficient of friction between the insect and the surface is 1/3. If the line joining the centre of the hemispherical surface to the insect makes an angle

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Q. An insect crawls up a hemispherical surfaces very slowly as shown in the figure. The coefficient of friction between the insect and the surface is

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