To make a wind sock you will need a carrier bag, some string, a pair of scissors, and an empty 2 litre pop bottle.
- Carefully cut a 3cm ring from your empty pop bottle.
- Cut a long thin strip from your plastic bag and loop it around your ring of plastic.
- Repeat step 2 until your plastic ring is covered, then tie a piece of string to the plastic ring.
Safe science – always take care when using scissors. Once the bottle has been cut, the plastic may be quite sharp. Remember that plastic bags can cause suffocation.
Now you have made a wind sock, take it outside and hold it above your head in the air. What happens? Why? If it’s a windy day, the wind sock should move. What do you think wind is?
How could you use the wind sock to measure the speed and direction of the wind? Start experimenting! You could attach the wind sock to a pole or the washing line in you garden or outside. Each day, take a look at the wind sock to see how fast the wind is moving and its direction.