4th class have been studying buoyancy recently and have been busy investigating why things float or sink. We discovered that for a boat to float it must have a lower density than the water. Density depends on two things; mass and volume. Mass is the amount of stuff that is in an object while volume is the amount of space it takes up. We also agreed that for something to float successfully in water it would need to be waterproof. We conducted two experiments; one to investigate what objects float and sink in water and the other to test what materials were waterproof.
After discussing these results, we decided to build our own boats. We again discussed the importance of volume, mass and density as well as using waterproof materials. The boys calculated the density of their boats to ensure they floated.
After weeks of hard work it was time to test our boats