# Explain me this concept (Laws of Motion)

Two blocks placed one on top of the other are lying on a horizontal smooth surface. The coefficient of friction between the blocks is $$\mu$$.

Case 1: Horizontal force F is applied to the lower block (Fig. 14).

[PLAIN]http://www.monbattle.com/1.jpg[/CENTER] [Broken]

Please help me to find out how they have got those equations. I'm trying to find it from past several hours but couldn't got any hint.​

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Hi snshusat161!