Cup telephones

Materials needed: 

2 Paper cups

10m String

2 Match sticks 

A partner &

A pencil

Procedure:

Step 1: Uses a sharp pencil to make a small hole in the bottom of each cup.

Step 2: Thread the end of the string through the each of the holes and tie each end of the sting around the match sticks inside of the cup, you do this so the sting does not pull back through the hole.

Step 3: Get your partner to hold one of the cups and u hold the other cup then slowly move apart so the string pulls tight.

Step 4: Hold your cup to your ear and then get your partner to talk into the cup, listen quietly to the sound of their voice.

Step 5: Continue doing this and reversing roles observe what happens  

Here are the official instructions: