Yesterday afternoon we did a science experiment about floating and sinking. We started with a piece of plasticine that was the same weight but changed the shape of the object to see whether it made a difference whether it floated or sunk. We found out that two objects can be the same weight but one may float and one may sink. This is to do with the shape of the object. I.e. a metal ball will probably sink but a metal boat will float. We learned that there are two forces working here. 1. gravity or weight and 2. upthrust or water resistance. So if the force of gravity/weight is greater than the force of upthrust the object will sink whereas if the force of gravity/weight is less than the force of upthrust the object will float.