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Tuesday, 30 July 2019

Hurumanu.........Weather.

Weather and Climate Change 

Measuring weather.

Aim : To Measure Wind Speed By Using An Anemometer.

Wind

Beaufort
Force
Wind Speed
(KPH)
SpinsIndicatorsTerms Used in NWS Forecasts
00-20Calm; smoke rises vertically.Calm
12-510Shown by direction of wind smoke drift, but not by wind vanes.Light
26-1240Wind felt on face, leaves rustle; ordinary vanes moved by wind.Light
313-2080 Leaves and small twigs in constant motion; wind extends light flag.Gentle
421-29130Raises dust and loose paper; small branches are moved.Moderate
530-39190Small trees in leaf begin to sway; crested wavelets form on inland waters.Fresh
640-50250Large branches in motion; whistling heard in telephone wires; umbrellas used with difficulty.Strong
751-61320Whole trees in motion; inconvenience felt walking against the wind.Strong
862-74390Breaks twigs off trees; generally impedes progress.Gale
975-87470Slight structural damage.Gale
1088-101550Seldom experienced inland; trees uprooted; considerable structural damage occurs.Whole gale
11102-116640Very rarely experienced inland; accompanied by widespread damage.Whole gale
12117 or more730+Very rarely experienced; accompanied by widespread damage.Hurricane

Wind speed - Making an anemometer.

Anemometer

MATERIALS

  1.                                           Straws (x4)
  2. Cups (x4)  
  3. Pin.  
  4. Pencil.  
  5.  Tape.  

STEPS

  1.   Make holes on each side of each cup
  2.   Connect the four straws together stick straws through the cup holes.
  3.   Bend the leftover straw and tape to cup.
  4.   Make sure the cups openings are facing the other cup.
  5.   Stick pin through straws connect the rubber on the pencil.
  6.   Put outside and try it out.
Once you have made an anemometer we are going to record the wind speed.

Group size: 5

You will need:

Anemometer (above) 

Roles:


  • Timekeeper
  • Counter
  • Recorder
  • Anemometer Manager
  • Wind generator
  1. Mount the anemometer in a place that has full access to the wind from all directions.
  2. When the time keeper says "Go", the counter in each group will count how many times the marked cup passes them in one minute and write it down.
  3. If possible, repeat the above step four (4) times and record the average number of spins on the chart.

FINDINGS

  • Record how many times it spins using the table below.
You will need to create the wind yourself by blowing. Get 4 different wind speeds by blowing.

You will need to time them and count the number of spins.

Time IntervalNumber of Spins
1.10 sec7 spins
2.10 sec6 spins
3.10 sec6 spins
4.10 sec5 spins
  • Can you make a statement connecting the number of spins of your anemometer and the speed of the wind? 

CONCLUSION

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