First slide
Kinetic friction

A system consists of three masses m1, m2 and m3  connected by a string passing over a pulley P. The mass m1 hangs freely and m2 and m3 are on a rough horizontal table (the coefficient of friction= μ)

The pulley is frictionless and of negligible mass. The downward acceleration of mass m1 is 

 (Assume m1=m2=m3=m



Force of friction on mass m2=μm2g        

Force of friction on mass     m3=μm3g        

Let α be common acceleration of the system.


 Here, m1=m2=m3=m

 Hence, the downward acceleration of mass m1 is g(12μ)3


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