Weather and Climate Change
Measuring weather.
Wind
Beaufort Force | Wind Speed (KPH) | Spins | Indicators | Terms Used in NWS Forecasts |
0 | 0-2 | 0 | Calm; smoke rises vertically. | Calm |
1 | 2-5 | 10 | Shown by the direction of wind smoke drift, but not by wind vanes. | Light |
2 | 6-12 | 40 | The wind felt on face, leaves rustle; ordinary vanes moved by wind. | Light |
3 | 13-20 | 80 | Leaves and small twigs in constant motion; wind extends light flag. | Gentle |
4 | 21-29 | 130 | Raises dust and lose paper; small branches are moved. | Moderate |
5 | 30-39 | 190 | Small trees in leaf begin to sway; crested wavelets form on inland waters. | Fresh |
6 | 40-50 | 250 | Large branches in motion; whistling heard in telephone wires; umbrellas used with difficulty. | Strong |
7 | 51-61 | 320 | Whole trees in motion; inconvenience felt walking against the wind. | Strong |
8 | 62-74 | 390 | Breaks twigs off trees; generally impedes progress. | Gale |
9 | 75-87 | 470 | Slight structural damage. | Gale |
10 | 88-101 | 550 | Seldom experienced inland; trees uprooted; considerable structural damage occurs. | Whole gale |
11 | 102-116 | 640 | Very rarely experienced inland; accompanied by widespread damage. | Whole gale |
12 | 117 or more | 730+ | Very rarely experienced; accompanied by widespread damage. | Hurricane |
Wind speed - Making an anemometer.
MATERIALS
1. 4 straws
2. 4 cups
3. pin
4. pencil
5. tape
STEPS
- Step one is to get your cups and poke a hole on the top side of your cup and make it go through on each cup.
- Then get your four straws to take two and connect it together then tape it after doing that do that with the other two.
- After taping each straw together and make a plus.
- Then get you to pin and pin it in the middle of the plus.
- Then stick the straws where you poke the hole on the cups.
- The last step is to tape the pencil to the middle of the plus/cross. It will hopefully look like this.
- Step one is to get your cups and poke a hole on the top side of your cup and make it go through on each cup.
- Then get your four straws to take two and connect it together then tape it after doing that do that with the other two.
- After taping each straw together and make a plus.
- Then get you to pin and pin it in the middle of the plus.
- Then stick the straws where you poke the hole on the cups.
- The last step is to tape the pencil to the middle of the plus/cross. It will hopefully look like this.
Once you have made an anemometer we are going to record the wind speed.
Group size: 5
You will need:
Anemometer (above)
Roles:
- Timekeeper -Risha
- Counter-Sahara
- Recorder- Rarotonga
- Anemometer Manager - Nevaeh
- Wind generator- Heat pump, Human breathe slowly, outside, Human breathe fast
- Mount the anemometer in a place that has full access to the wind from all directions.
- When the timekeeper says "Go", the counter in each group will count how many times the marked cup passes them in one minute and write it down.
- 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 Interval | Number of Spins | |
1. | 10s | Heat pump-5 |
2. | 10s | Human breathe slowly-3 |
3. | 10s | Human breathe fast-7 |
4. | 10s | Outside -2 |
- Can you make a statement connecting the number of spins of your anemometer and the speed of the wind?
CONCLUSION:
The fast breath was very fast
and outside was very slow because there was no wind