Buoyancy vs gravity


Our science lesson yesterday

We are going to build our own tin foil barges and see how much cargo they can successfully carry.

One of our groups managed the grand total of 197 coin before it started to sink.

The more surface area an object has for the force to push up on, the greater chance it will float and the more weight it will hold.

Our wide, flat-bottomed barge has a large surface area in contact with the water, so is very buoyant.

When the tin foil barge weighs less than the amount of water it displaces then it floats.

When the tin foil barge weighs more than the amount of water it displaces, because it is loaded with coins, it sinks


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