Buoyancy and Flotation Diagnostic
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Buoyancy and Flotation Diagnostic
Read the test notes
In a tub of fresh water, the class tested a sealed empty plastic bottle, a stone and a lump of modelling clay. The bottle floated high. The stone sank. The clay sank when it was a solid ball, but floated after it was shaped into a wide, hollow bowl. The bowl could support several small counters before it sank. Water pushes upwards on objects in it; this upward push is called buoyancy. An object floats when the upward push can balance its weight. How an object's mass is spread through its volume matters: a hollow shape can displace more water and receive a stronger upward push.
- The stone only
- The sealed bottle only
- Both objects
- Neither object
- The sea has no gravity
- Its hollow hull makes the ship displace a large volume of water
- Steel always floats in salt water
- The ship has no weight when moving
2 printable pages
Page 1
Page 2
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