Want to wake up
your parents?
30 minutes
How can you wake up your parents on a Sunday morning, at the time YOU want? Make a horn that you can use to get them out of bed.
Requirements
Steps
Most straws have a bendy bit. You don’t need this, so cut it off, just next to the place where it starts. Use the long part of the straw for your horn.
Pull the balloon opening 2 centimetres over the toilet roll. Cut a small hole at the tip of the balloon, just big enough for the straw to go in.
Push the straw around 1 centimetre into the hole and use the sticky tape to stick the straw onto the balloon. It should be airtight.
In one hand, hold the toilet roll vertically in front of you. Use your other hand to hold the straw and pull the balloon tightly over the top of the toilet roll. Blow hard into the straw. Can’t hear anything? Make sure that the balloon fits tightly over the toilet roll.
Tip
Instead of a toilet roll, use a kitchen roll or the cardboard roll in kitchen foil or aluminium foil. Does the horn now make a higher or a lower sound?