6. Cut a pice of paper towel to the size of a £5 note and wet in water
7. Fold this round the string at the top of the cup and pull down! (See the video clip) A pocket tissue also works well.
8. You can also make a silly chicken noise it you check out the video!
The Science bit
The cup acts like a sound board. If you rubbed the towel down the string without it, you would not hear any sound, but the cup amplifies the vibrations created by the movement and you get the sound!
A craft stick or lolly stick chain reaction is a brilliant example of potential and kinetic energy. As you weave
These easy squeezy bottle rockets are great fun to make and a brilliant introduction to forces, in particular Newton’s Third
Original article and pictures take http://www.science-sparks.com/2011/10/24/making-eerie-sounds/ site
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