The video clip below, taken from Youtube demonstrates a well-known party trick. A coin is placed on a card and placed over the mouth of a bottle. Watch the video to see what happens when the card is flicked away with a finger.
http://www.youtube.com/watch?v=sYOvqfvKnj0″ height=”480″ width=”640″ allowfullscreen=”” frameborder=”0″>
And the question is: Why did the coin drop into the bottle and not fly off with the card?
- Newton’s first law of motion, inertia, motion, rest.