Question

how much force F is equal to applied on the block of mass M is situated on frictionless surface so as to keep another block of mass M at rest on its surface

Answer 1

Answer:

-F force is required to hold it

Answer 2

$\huge\bigstar\underline\pink{Answer}$

★ case 1:- if there is absent between blocks

then you can apply any force, block kept above will remain at rest only.

★case 2:-if friction is present

then applied force must be equal to frictional force to keep block at rest.

$\huge\red{\ddot{\smile}}$