EXPERIMENT
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Have students use modelling clay to make a fish-shape 10 to 15 cm long, and to make objects of various other shapes, e.g., flat, round, square, human.
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Have students put a stick in the shapes they made, and gently move them through a basin of water.
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Have the class observe how different objects move in the water, and record their observations on a chart or chalkboard. If necessary, prompt them with questions such as:
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What shape makes the fewest ripples when it moves? What makes the most?
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What shape takes the least force to move? What takes the most?
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What shape moves the quickest? What moves the slowest?
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Do the shapes move the same backwards or sideways as they do forward?
DISCUSSION