Experimental
technique |
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Jonathon notices
two water tanks with holes in them as shown below. He observes that water
leaks faster from one tank than the other. He wants to test why this is
so. He designs an investigation to answer the question "Does water leak at a faster rate from a hole that is high above the base of the tank than one that is close to the base?" |
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What are the factors that will influence the rate at which water leaks from the hole in a vertical tank of water? -The amount of water in the
tank. These factors are called variables because they can change the results.
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We need to investigate how
the height of the hole influences the rate at which water escapes? |
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The
only variable that is different in each drum is the height of the hole.
This is the variable that we are testing for. When we compare the two drums
we see that the flow of water escaping from the hole near the base of the
drum is greater than the water flowing from the hole higher up. This is a fair comparison between the two drums and Jonathon can confidently conclude that the rate of water flow is greater through a hole near the base of the drum than one that is higher. |
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