Science Projects And Inventions

YOU NEED

• A hammer
• A ruler
• A loop of string
• A table

Make an odd structure and make it balance on the edge of a table.

Take the length of string. Turn the string into loops so that it looks like a bracelet.

The illustration reveals how the string bracelet can hold on to the end of a ruler which in turn is attached to the end of a hammer handle.

Now put the other end of the ruler on the table edge as in the illustration.

You will notice the structure will stay balanced though it seems that the heavy head of the hammer will make it drop to the floor.

HOW DOES IT WORK?

What actually happens is that centre of gravity of the system is shifted to a point slightly under the edge of the table by the heavy head of the hammer.