Overcoming Gravity
You Will Need:- Drinking Glass
- Water
- Playing card or post card (make sure its big enough to cover the top of the glass)
- Towel or Tub (in case of trouble)
- Fill the glass 3/4 full of water
- Place card squarely over the mouth of the glass, making sure there is no gap
- Pressing the card to the rim, turn the glass over, maybe over your volunteer's head
- When the glass is upside down, remove your hand from the card
- The card should remain attached to the glass and no water should leak out
The simple explanation to this experiment id that it all depends on air pressure. The water in the glass certainly presses down on the card, but what's surprising is the strength of the air pressure working in the opposite direction - greater than the force of gravity in this case!
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