Why did the egg twitch the card quickly in the experiment of falling into the cup? If you twitch slowly, ...

Inertia and friction determine the success or failure of the experiment!

When you pull out the paper, the friction of the egg on the paper is opposite to the force exerted by the hand, and their combined force determines the acceleration of the paper, which in turn depends on the force of the hand, while the friction of the egg on the paper is constant, that is, the acceleration of the egg is constant, so the greater the force exerted when you pull out the paper, the greater the acceleration of the paper, and the shorter the time for the paper to be pulled out and the shorter the time for the egg to accelerate. So, take out the paper quickly. Before the egg moves, it has lost the power to accelerate. Of course not. Otherwise, the eggs will have time to accelerate and the experiment will fail.