HOW TO MAKE A PAPER CLIP FLOAT

In this experiment you will make a paper clip float!!

Materials:

Clean dry paper clip

Tissue paper

A bowl of water

Pencil with eraser

Instructions

Fill the bowl with water.

Drop the paper clip on the water you will observe that the paper clip sinks.

Tear the tissue paper into half and gently drop it on the surface of water.

Gently drop the paper clip onto the tissue paper the tissue paper should not drown.

Now carefully with the help of pencil’s eraser push the tissue paper 

under the water and............ THE PAPER CLIP IS FLOATING

What is happening?

When you put the paper clip on the tissue and remove the tissue the paper clip floats due to SURFACE TENSION. Surface tension is a property of the surface of a liquid that allows it to resist an external force

HOMEMADE TELEPHONE

In this experiment you will make a string telephone !

Materials:
2 paper cups
A long elastic string (the longer the better)
2 pins

Instructions

Make a hole at the bottom of the cup.

Now tie one end of the elastic thread to one glass and the other end to another glass.

And here your telephone is ready!

Now ask your friend to put the opening of the cup into his ear and you hold the other cup to your mouth and say a sentence, ask your friend whether he heard the sentence or not?

What happens?

When you speak from one glass sound vibrations are made. The sound vibrations travel through the string and the same sound vibrations are produced in the other cup! This is how your friend hears the sentence!!