In the diagram below, there are three containers and each has the same amount of water.
Container 1: Two cups of water
Container 2: Two cups of water + one rock
Container 3: Two cups of water + a cup with coins
Notice how high the water surface is in each container. Remember that the amount of water is the same in each container. So how does the water lever change?
The rock in container 2 pushes the water out of its way. This means that the rock displaces (pushes aside) the water. The volume of the rock equals the volume of water that is displaced (pushed aside) by the rock.The rock does not float.
The cup with coins in container 3 pushes the water out of its way. But unlike the rock, the cup of coins floats in the water. The volume of the cup below the water’s surface is equal to the volume of the water displaced (pushed aside) by the submerged part of the cup.
Why does the cup of coins float and the rock sinks?
|Sticky, Gloppy, Wacky, and Wonderful Experiments|