Science Projects And Inventions

YOU NEED:

• A bouncing ball made of hard rubber
• A table

Here is a trick to amuse your friends. You can tell them you have discovered a way by which you can throw the ball in

such a way that it will halt in midair, turn directions, and come to you. Your friends would like to see this trick. It is

not difficult to procure a bouncing ball made of hard rubber. You can get it a shop selling sports goods or even at

your neighborhood store. A little spin on such a ball makes it bounce. Now try this on table  that is standing on a

hard surface. Throw the ball as  shown in the ''illustration by the arrow marks. The ball will hit the table's underside;

reverse its direction and bounce back to you.

HOW DOES IT WORK?

As soon as the ball strikes below the table in a slant a strong backspin is created on the ball causing it to

bounce backward. You can try this too. Just toss the ball straight up in the air. Then say that you are also

able  to drop the ball from a height of four feet, and it will not hit the floor. How does this happen? Drop it and

catch it with your hand.