Question

Q2) A 400-gram package lying on a horizontal surface is attached to a horizontal string which passes over a smooth pulley. When a mass of 200 grams is attached to the other end of the string, the package is on the point of moving. Find μS, the coefficient of static friction

Answer 1

Where, is force of friction , is coefficient of static friction, N is normal force on 400 g block, g in 0.4 g and 0.2 g is acceleration due to gravity and g = 9.8 m/s².

The force equation for the 400 gram block is :

                              

                   and     

   or,

   or,                       .........................................(1)

The force equation for the 200 gram block is :

                              

Putting the value of T in equation (1), we get

                             

                         

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