Tuesday, 19 May 2009

Cutting Ice, Water Clock and Water Pressure Experiments

Cutting Ice Experiment

Gather required equipment: a wire coat hanger, tea towel, dental floss, pliers and a cube of ice.
Using the pliers snip the coat hanger to desired length; we cut ours to approximately 200mm
Bend both ends and make a hook as shown in photo
Tie dental floss and make as taut as possible
Try cutting quickly ...
try cutting slowly ...
or even try cutting whilst standing near the fire to see if ice will melt quickly
Whether it was because our dental floss wasn't as taut as I initially thought I had made it, but the experiment worked fine using either a slow or fast cutting motion.

Ice is melting right at the point of contact and as the dental floss goes through it’s kind of refreezing above it.

Learn more by taking the Prof's next water class.

Water Clock Experiment

Gather required equipment: Two containers, ruler, strong tape, marker pens, stopwatch and water
Make a small hole in the top container then tape both containers to the ruler.
While placing your finger over the hole fill the top container and mark the level
When ready, remove finger from below the hole and watch the stopwatch marking the bottom container at whatever time intervals you wish ... we chose every 30 seconds aiming for 2 minutes in total

Ancient Egyptians and Chinese both used different ways of measuring water to use a clock.

God made time using stars. We can still tell the time like this today.

In the old days they used long containers or circles.

If you use peanut butter containers like we did because we had no yoghurt punnets (or similar), you won't actually have all the water drop into the bottom container unless you remember to put the hole at the lowest point of the container. On our first attempt we had the hole on the concave!!! In actual fact it was a good mistake to make because we discussed why the water didn't empty entirely ... because once the water got to the level of the hole, no more water could come out as the water level was lower the hole.

Word scramble and yes, tamāhine 1 did this scramble all by herself. I was really impressed!!

Learn more by taking the Prof's next water class.

Water Pressure Experiment
This is an experiment the children remembered attempting at Playcentre some weeks ago, but it was great to create it again because we were able to understand it a little better.For every square inch of our skin there is 14.6 pounds of pressure pushing down. Not only is it pushing down, but it gets pushed up as well because it's all around us. That's why we don't get squashed.
When you're under water you get more pressure. If we were under the water in a submarine and you can't get the pressure equalised, it can actually crush the submarine if it goes too deep.

Learn more by taking the Prof's next water class.

Like I've mentioned throughout today's post: to learn more, take the Prof's next Water Water Everywhere! class. From our family's point of view the class was awesome. We highly recommend it as we thoroughly enjoyed the four weeks of learning.

Thanks for dropping by
ka kite ano

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