Final answer:
When you pull out the strip of paper fast, inertia causes the stack of coins to mostly remain in place due to insufficient friction to move the coins substantially.
Step-by-step explanation:
When you pull a strip of paper from beneath a stack of coins quickly, the coins exhibit the physics principle of inertia, where an object in rest stays at rest unless acted upon by an external force.
In this scenario, the strip is moved fast enough that the friction between the coins and the paper is insufficient to move the coins substantially.
As a result, the stack of coins should largely remain in place or only move slightly depending on the friction and the speed of the pull.