A 6 kg block rests on a horizontal table, attached to a 5 kg block by a light string as(adsbygoogle = window.adsbygoogle || []).push({});

shown in the figure.

The acceleration of gravity is 9.81 m/s2 .

A) What is the minimum coefficient of static

friction such that the objects remain at rest?

I already got part A which is 0.833, but need help on B

B) If the coefficient of static friction is less than

that found above, and if the coefficient of

kinetic friction between the block and the

table is 0.2, find the time it takes for the 5 kg

mass to fall 9 m to the floor if the system

starts from rest.

Answer in units of s

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# Friction problem of a 6kg block

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