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Grade: 11


two blocks of masses m 1 and m 2 are placed in contact with each other on a horizontal platform . the coefficent of friction between m 1 and the platform is 2µ and between block m 2 and platform is µ . the platform moves with an acceleration a . the normal reaction between the blocks is: a. zero in all case b. zero only if m 1 = m 2 c. non zero only if a > 2µg d. non zero if a > µg

11 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points

dear rohan bhatia

in this question relative position of blocks and direction of acceleration of plateform is not given

so i will take a perti cular case



in the diagram normar reaction between block is taken zero

and shown frictional force is maximum

max acc for block m1=2µg

max acc for block m2=µg

clearly when a>µg slipping occure and there must have normal reaction betwwen blocks

so option c and d is correct

normal reaction is zero for a<ug

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Askiitians Experts


11 years ago
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