Making An Anemometer
.4 small paper cups
.4 plastic drinking straws
.Pencil with a new eraser
1.Take consent of the child to begin the experiment .
2.Introduce the name of the experiment and explain its purpose.Then introduce the apparatus to the children.
3.Arrange four (4) plastic drinking straws to from across and tape them together at the center.
4.Staple the top side of one drinking cup ,such as the small paper cup,to the end of each straw ,so the open ends of the cups all face the same direction.
5.Push a straight pin through the center of the straws into an eraser on the end of a pencil.This provided the axle.
6.Mark one of the cup or colour one of the cup;this will be the one they use for counting when the anemometer spins.When using this anemometer ,10 turns per minute means the wind speed is about one mile per hour.If would very useful to use a commercial anemometer to determine an approximate determination
;;When our anemometer read 20 spins a minute ,the commercial anemometer read 2 miles per hour,”
7.Blow on the anemometer or turn an electric fan on low to make sure that it spins easily .How many times the anemometer will spin in one minute?Can you make a statement connecting the number of spins of your anemometer and the speed of the wind ?(You can use the table below to record your practice trials.)
This anemometer has four cups which catch the wind and cause the anemometer to spin.The inward curve of the cups receives most of the force of the wind .That’s what makes the cups move.The more spins per minute ,the greater the wind velocity.
You can multiply the average number of spins by 60 to find out how many times the anemometer would spin in an hour and come up with a statement such as : the speed of the wind today is about 1,000 spins per hour.