Two blocks $A$ and $B$ are as shown in figure. The minimum horizontal force $F$ applied on block $B$ for which slipping begins at $B$ and ground is,

Diagram

140 N

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100 N

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120 N

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50 N

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Solution

The correct option is B $100 N$
The sliding shall start at lower surface first if,
$F_{e x t} > F_{f r i c t i o n . B} F_{e x t} > 0.5 (10 k g + 10 k g) \times 10 m / s^{2} o r F > 100 N$

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Two blocks 'A' and 'B' each of mass 'm' are placed on a smooth horizontal surface. Two horizontal force F and 2F are applied on both the blocks 'A' and 'B' respectively as shown in figure. The block A does not slide on block B. Then the normal reaction acting between the two blocks is: (Assume no friction between blocks)