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Jan 10, 2021 at 14:11 comment added user279008 Not quite. The normal reaction $N_1$ and $N_2$ accelerate $M$. Since my previous answer wasn't satisfactory, I have updated it.
Jan 8, 2021 at 9:44 comment added Brian But I think I get the idea now, in a real case, if the surface of big block was frictionless then the block on top of big block's horizontal motion woulc cause a swing , is that correct?)
Jan 8, 2021 at 9:43 comment added Brian I don't get this , if the mass on top of the big block moves with some acceleration, how does that the big block get same velocity? There is no friction and all
Jan 3, 2021 at 5:41 history edited John Darby CC BY-SA 4.0
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Jan 3, 2021 at 5:08 history edited John Darby CC BY-SA 4.0
edited body
Jan 3, 2021 at 5:00 history edited John Darby CC BY-SA 4.0
edited body
Jan 3, 2021 at 4:53 history edited John Darby CC BY-SA 4.0
edited body
Jan 3, 2021 at 4:41 history edited John Darby CC BY-SA 4.0
added 49 characters in body
Jan 3, 2021 at 4:36 history answered John Darby CC BY-SA 4.0