In my Science class and applying new evaluation system, we have studied the last unit of the term " Forces and their effects " in a practical way.
We have learnt about The Archimede´s Principle, the Upthrust, why some objects float but others don´t, why a submarine submerges and emerges...
They have brought the materials to develop different experiments in order to test the theories learnt in the unit.
It has been a complete success and below there are a few pictures where you can see it with your own eyes.
In the picture above one of my students Helena, started her first experiment proving that when she places an object into a glass of water, if the object´s density is less than the water´s density, then the object floats.
Then she tried with a material with a similar density to the water´s, which showed us that the object was only partially submerged and mantained its equilibrium in a specific position, and finally she placed a stone with a much greater density, so the stone sunk.
In the next picture, Helena explained why boats float. For the same reason that empty glass bottles float, but sink when they are full of water.
She also explained the mechanisms that submarines use; water is introduced into enormeous tanks until the weight of the submarine is greater than the upthrust so the submarine submerges. When a submarine wants to go up to the surface, a system of powerful pumps extracts the water from the tanks releasing it, so the submarine´s weight decreases and when it weighs less than the upthrust, the submarine emerges.
I am quite happy with the results. They also had to answer any question that came up in the class and send me a written project.
Here there are three examples of the written projects:
EXPERIMENTS. UNIT 4 HELENA BERREIRO YEAR 8 B.
EXPERIMENTS UNIT 4. DHARMA MATEU. YEAR 8 B.
EXPERIMENTS. UNIT 4. MARTA VACAS. YEAR 8 B.
Well done!
By Cristina Cuenca.
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