Science Projects And Inventions

YOU  NEED:

• A Magazine
• Playing cards

Flattern out a magazine on the floor. Hand over six playing cards to a friend. Ask him to drop each card from a few feet height. So it lands on the magazines. Show him how to hold a card, as shown in the illustration, but don’t tell him that the card has to be held vertically before it is dropped. If he holds the card vertically before dropping it, it will flutter to one side, missing the magazines. Now you show him the way to do it. You hold the card horizontally, so that the card is parallel to the floor. Let it go. The card will land on the magazines.

HOW  DOES  IT  WORK?

When a card is dropped, gravity pulls it towards the floor. The surrounding air , however, resists its downward fall. Dropped horizontally, it floats on the magazines given the air resistance is equal over the card surface. It dropped vertically, the card falls through the air on its thin edge because the flat surface encounters small air currents that result in the card turning slightly. While turning its slips sideways, on it’s the edge with less air resistance and it misses the magazine.