Floating & Sinking Investigation- SENTINUS Workshop 1.10.19
Today we completed 4 experiments investigating how different objects either float or sink. We discussed how the density of an object holds the the key as to whether it will float or sink. The density can be calculated by dividing an objects weight by its volume. Anything with a density lower that 1g/cm3 will float on water!
Firstly, we began with ‘Making an Orange Sink’. This experiment required pupils to think about to make a mandarin orange sink. Pupils soon realised that if they peeled their oranges it would sink, as the skin had air bubbles in it causing the orange to float.
Secondly, we moved on to making our own boats from plasticine. When rolled in a ball the plasticine sank but when stretched out it floated, even though it still weighed the same. However we had made the volume of the plasticine bigger making it float. One group managed to get 33 marbles into their boat before it sank!
Next we experimented with changing the water pressure in a bottle which made our ‘Cartesian Diver’ sink by reducing the air bubble inside it.
Finally we experimented with the surface tension of water. Surface tension is created by hydrogen and oxygen molecules sticking together. This involved making a paper clip which usually sinks, to float on its side. We then realised that fairy liquid helps reduce the surface tension of water.
Congratulations to our brilliant P7 pupils who received the Sacrament of Confirmation today in St Joseph’s Church Ballykinler. They prepared excellently and their reading, singing and involvement in today’s ceremony was a source of pride to the whole school community. Thanks to Fr McKinley and Fr Fleck for a lovely service and to our friends from St Joseph’s Tyrella for their warm welcome and assistance in preparations!
The pupils completed a three day Bike Safety Workshop. The workshop focused on improving pupils' ability to be safe on the road and in built up areas. The children learned many new skills, manoeuvres and important safety information. They had a great time and completed all elments of the course. Sustrans are presenting certificates to the children to recognise their achievements!
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