Measuring weather.
Definitions:
- Anemometer: Is an instrument which measures the wind.
- Beaufort wind scale:
MATERIALS
- Sellotape
- Pencil
- 2 pencils
- 4 cups
- Pin
STEPS
- Sellotape the sticks to the cups.
- Sellotape the sticks together to make a cross.
- Pin the cross to the rubber on the pencil.
Group Investigation.
Groups size: 5
Roles:
Groups size: 5
Roles:
- Timekeeper
- Counter
- Recorder
- Anemometer Manager
- Wind Manager
- Mount the anemometer in a place that has full access to the wind from all directions.
- 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.
- Repeat the above step four (4) times and record the number of spins on the chart.
FINDINGS
- Record how many times it spins and record it in the table below.
- You will need to time them and count the number of spins.
| Place name on school grounds | Number of Spins in 15 seconds | |
| 1. | Field | 20 |
| 2. | Old J Block site | 15 |
| 3. | Grass hill in squad | 10 |
| 4. | Tennis court gate | 3 |
- USING A4 PAPER DRAW YOUR RESULTS ON A GRAPH.
- TAKE A PICTURE OF THE GRAPH AND UPLOAD IT TO YOUR BLOG
WHICH IS THE WINDEST AREA AND WHY?WHICH IS THE CALMEST AREA AND WHY?WHERE IS THE BEST PLACE ON LAND TO BUILD A WINDMILL?
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| Sorry for the bad quality |
CONCLUSIOn:
On the field, the Anemometer spun 80 spins per minute. It had a wind speed of 13-20 kph. This speed is 3 on the Beaufort Scale. (Leaves and small twigs in constant motion; wind extends light flag.)
On the old J Block site, the Anemometer spun 60 spins per minute. It had a wind speed of 13-20 kph. This speed is 3 on the Beaufort Scale.
On the Grass Hill in the squad, the Anemometer spun 40 spins per minute. It had a wind speed of 2-5 kph. This speed is 1 on the Beaufort Scale. (Shown by direction of wind smoke drift, but not by wind vanes.)
On the Tennis Court gate, the Anemometer spun 12 spins per minute. It had a wind speed of 2-5 kph. This speed is 1 on the Beaufort Scale.
According to the data, the most spins on the Anemometer is on the field, with 80 spins per minute and it had a wind speed of 13-20 kph. The least spins on the Anemometer was by the Tennis Court gate, it spun only 12 spins per minute. It had a wind speed of 2-5 kph.
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 direction of wind smoke drift, but not by wind vanes.
|
Light
|
2
|
6-12
|
40
|
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 loose 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
|
