Look at these two ice cubes. If I leave one on the windowsill and one in a shaded corner, will they melt at the same speed?
How could we find out fairly?
Our question: Which place melts an ice cube fastest?
Our three places today: windowsill, shaded corner, and near the heater.
Predict which place will be fastest and say why. Predictions are the start of the science, not a guess to get right.
A fair test means we change one thing, measure one thing, and keep the rest the same.
Now we plan our test together on the board, sorting cards about our ice investigation into three bins: Change, Measure and Keep the same.
Help us sort each card into the right bin. Watch and talk first; keep your journal closed until we finish the board.
When every card is in place, copy the finished plan onto your Investigation Journal page so it matches the board.
Which place melts ice fastest?
Watch the timer on the board. It counts down 15 minutes. We open it now, before any cube is set down, and start it together when every cup is in place. When it reaches zero, we bring the cups back.
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