Egg Cartons or Small Disposable Drinking Cups
Thumb Tacks (push pins) or Sewing Pins
Pencil with eraser
Meteorologists measure wind speed in miles/hour. I asked the older kids how the measurements from the anemometers could be converted into miles per hour and let them think about it overnight. My 12 year old has covered the math skills required to perform this calculation, but my 10 year old has not. None the less, thinking about the conversion is an excellent brain workout in logical thinking.
To convert revolutions per minute to miles per hour the revolutions need to be changed into a distance of miles and the minutes need to be converted into miles. My son measured the distance between two cups and multiplied by 4 to find the distance traveled in one revolution. Then he asked me how to convert inches into miles. After telling him there were 63360 inches/mile he was able to determine that the wind speed was less than one mile per hour.
Here's what the conversion calculation looks like using the formula for circumference instead of my son's estimate:
This give the results in miles/hour. (d is the diameter of the anemometer).
We are just beginning our Earth Science Unit Study. To follow along be sure to sign-up to follow Highhill Education by email.
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