Science • Year 5
The Big Water Test
Liam and Maya want to find out how shapes move through water. They plan a fair test and control their variables carefully.
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Scene 1 of 2
Maya and Liam wanted to learn about water resistance. They made two different shapes from the same mass of blue modelling clay. Liam held a round ball, and Maya held a flat disc. 'We must do a fair test,' said Maya. 'We have to drop them from the same height into the water.'
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Scene 2 of 2
Liam counted down, and they dropped the shapes at the same time. The round ball fell quickly to the bottom, but the flat shape moved down slowly. The flat disc had a larger surface area, so it met more water resistance. Liam timed the drop with his blue watch, and Maya wrote down the seconds. They smiled because their test was fair.