This task is about constructing a water timer.
You are going to make and test a water timer. Follow the instructions below to make the timer.
| 1. | Push the drawing pin through the bottom of the cup to make a small hole. |
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| 2. | Cut the top off the plastic drink bottle so that the cup can fit into the top of it (make sure an adult helps you with this step). |
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| 3. | Fill the cup with water and using a timer or clock and a felt pen, mark the water level on the outside of the bottle every minute for 5 minutes. Label these markings 1, 2, 3, 4, and 5. | |
| 4. | Show your timer, with its markings, to your teacher. | |
| 5. | Now, without using a timer or clock, make marks on your bottle to show 7 minutes and 10 minutes. | |
| 6. |
To test your marks, fill your water timer to the 5 minute mark. Your teacher, or a partner, will then use a timer or clock to check the marks you have made for 7, and 10 minutes.
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Peer assessment sheets
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Partner's Name: ________________________
My partner's markings for 7, and 10 minutes are:
Excellent
(very accurate)
Good (quite accurate)
Need work (not so accurate)
|
Partner's Name: ________________________
My partner's markings for 7, and 10 minutes are:
Excellent
(very accurate)
Good (quite accurate)
Need work (not so accurate) |
Partner's Name: ________________________
My partner's markings for 7, and 10 minutes are:
Excellent
(very accurate) Good (quite accurate)
Need work (not so accurate)
|