Block A is placed on block B, whose mass is greater than that of A. There is friction between the blocks, while the ground is smooth. A horizontal force P , increasing linearly with time, begins to ac

Question

Block A is placed on block B, whose mass is greater than that of A. There is friction between the blocks, while the ground is smooth. A horizontal force $P$ , increasing linearly with time, begins to act on A. The accelerations $a_{1}$ and $a_{2}$ of A and B respectively are plotted against time $t$ . Choose the correct graph:

TestHub · Accepted Answer

Initially the blocks move together, so a 1 ​ = a 2 ​ along one rising straight line. Once P exceeds the force that friction can transmit, slipping starts: a 1 ​ keeps rising faster while a 2 ​ becomes the constant μ m A ​ g / m B ​ . This is graph (C).

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