A block A with mass $$100$$ kg is resting on another block B of mass $$200$$ kg. As shown in figure a horizontal rope tied to a wall holds it.The coefficient of friction between A and B is $$0.2$$ while coefficient of friction between B and the ground is $$0.3$$. The minimum required force F to start moving B will be

Question

A block A with mass $$100$$ kg is resting on another block B of mass $$200$$ kg. As shown in figure a horizontal rope tied to a wall holds it.The coefficient of friction  between A and B is $$0.2$$ while coefficient of friction between B and the ground is $$0.3$$. The minimum required force F to start moving B will be

Infinity Learn · Accepted Answer

F $$=$$ $$fAB+fBG$$   $$=$$ μ$$ABmag+$$μ$$BG(mA+mB)g$$   $$=$$ $$0.2$$ × $$100$$ ×$$10$$ $$+$$ $$0.3(300)$$×$$10$$    $$=$$ $$200$$ $$+$$ $$900$$ $$=$$ $$1100$$ N

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