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Question

A rolling body of mass m=4kg, radius R and radius of gyration k=R/3 is placed as a plank which moves with an acceleration a0=1 ms2. Find the frictional force acting on the body if it rolls without sliding(in N).
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Solution

let the friction force be f
now f=macm.....(1)
fR=mR2α/3...(2)
for no slipping acm+αR=1....(3)
on solving above equation we get
f=43ff=1N

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