explain what's happening in this experiment:

EXPERIMENT 1: FIRST LAW Place the card on top of the glass. Make sure there is enough space to give one edge of the card a good flick without smacking your finger on the glass. Ouch! .Place a single coin on top of the card so that it rests over the cup's opening. . Flick an exposed edge of the notecard. Don't flick the card from underneath. Flick directly from the side of the card's edge. . The coin drops straight into the glass