A block with mass M lies on a slippery horizontal surface. On top of it there is another block with mass m which in turn is attached to an identical block by a string. The string
has been pulled across a pulley situated at the corner of the big block and the second small block is hanging vertically. Initially, the system is held at rest. Find the acceleration of the big block immediately after the system is released. You may neglect friction, as well as masses of the string and the pulley.
- $$ \sum F =ma$$
Clearly, in the picture I can see that on the small block on top, tension and gravitational force act. Gravity gets balance by the normal force, so tension is the only force causing acceleration. On the block at the side gravity and tension result in vertical acceleration. However, I do not see any force acting on the big block except the normal forces and gravity, which appear to me, to balance out. So, which force am I missing out on that causes the acceleration? And after that how should I go about finding the constraint equations? Any help would be appreciated.
I have also attached the given answer.
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