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Explain the model of windmill
A windmill in a tall structure that converts wind into energy. Windmills were invented in eastern Persia as early as the 9th century and were often developed for using in milling grains for means of food production. In modern days, wind turbines (a form of windmill) are used to generate electricity.

Aim:-To construct the model of a windmill.

Materials Required:-Construction paper, Cardstock, Printer paper, Plastic straws, String, Paperclip, Tape, Scissors, Glue, Wooden skewers, Hole punch.


Procedure:-

1.Cut out a square of each type of paper.
2.Draw an X diagonally, from corner to corner, on each one.
3.Use a hole punch to make a hole in the center large enough for the straw to fit        through.
4.Cut along each line, but stop about half an inch from the center hole.
5.Bring each free corner down to where the cut stops near the center of the paper and secure it with glue. This will create the ‘sails’ for your windmill.
6.Insert a straw through the center of each windmill, this will serve as the axis.
7.Insert a wooden skewer through the straw so it can rotate freely.
8.Towards the end of the straw, tape one end of a piece of string to the straw. Tie or tape the other end of the string to a paperclip.
9.Hold the ends of the wooden skewer and blow on the sails of your windmill model.



Observation:-The string will wind around the straw as the windmill moves and the paper clip will be lifted. Cardstock will likely produce the best sails because it is the stiffest. Printer paper will have the weakest sails.

Inference:-The shape created when folding the corners of the paper into the center creates a sail, which will catch your breath when you blow on it. Your breath will then rotate the wheel, which will rotate the axis. Because the axis is connected to the string and the dangling paper clip, it will convert the energy from your breath, harnessed by the wheel, into useful work by twisting up the string and lifting the paperclip.





 


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