Guest

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

two blocks of masses m1 and m2are placed in contact with each other on a horizontal platform . the coefficent of friction between m1 and the platform is 2µ and between block m2 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 m1 = m2


c. non zero only if a > 2µg


d. non zero if a > µg


 

Grade:11

1 Answers

Badiuddin askIITians.ismu Expert
148 Points
14 years ago

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

 

5112-864_7662_untitled3.JPG

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


Please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly.
 We are all IITians and here to help you in your IIT JEE preparation.

 All the best rohan bhatia.
 
Regards,
Askiitians Experts
Badiuddin

 

Think You Can Provide A Better Answer ?

ASK QUESTION

Get your questions answered by the expert for free