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Friction

Question

A body of mass 1 kg rests on a horizontal floor with which it has a coefficient of static friction 13 . It is desired to make the body move by applying the minimum possible force F N. The value of F will be ______. (Round off to the Nearest integer) [Take g=10 ms2 ]

Moderate
Solution

Minimum force =μmg1+μ2=13×101+13=5 N



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Two masses A and B of 5 kg and 6 kg respectively are Connected by a string passing over a frictionless pulley fixed at the corner of table as shown in the figure. The coefficient of friction between A and the table is 0.3. Find the minimum mass of C (in kg) that must be placed on A to prevent it from moving (Take g = 10 m/s2).


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