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Choose a selection of different materials and test whether they float or sink. (the bath or sink is a good place to test this). The objects could include things such as rocks, plastic bottles, rubber bands etc.


Once you have collected some different items, predict (make a guess) at whether you think they will float or sink.

Why do you think they will float?

Why do you think they will sink?


Now, test your objects.


Conclusion – were your predictions, right? Did any surprise you?

Why do you think they floated/sank?


If you would like to, you could write your predictions and conclusions down.