amsti investigations-variables
DESCRIPTION
AMSTI Investigations-Variables. Flippers and Catapults. Catapult. A catapult is a lever arm that is loaded with energy . When energy is released, any object resting at the end of the lever is hurled into the air. Catapults made with items from around the house. - PowerPoint PPT PresentationTRANSCRIPT
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AMSTI Investigations-
Variables
Flippers and Catapults
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Catapult
• A catapult is a lever arm that is loaded with energy. When energy is released, any object resting at the end of the lever is hurled into the air.
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Catapults made with items from around the house.
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How is a slingshot a catapult?
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How is a diving board a catapult?
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What is a lever?
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• Where is the lever and how is it being used?
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Systems• A system is any group of objects that is
related in some way.
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In our flipper system, the items that are related are
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Variable•Is ANYTHING that can be varied or changed in a controlled experiment.
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Experimenting IS Important in Science
• 1. An experiment compares 2 or more investigations in which ALL of the variables are CONTROLLED – except the variable that is being investigated.
• ? HOW did you control variables in the swinger investigation while you were testing?
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Experimenting IS Important in Science
• 2. A controlled experiment is a series of experiments….where one variable is changed and all other variables are controlled.
• ? What series of experiments did you do to find out how many passengers lifeboats would hold?
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• 3. An experiment must have multiple trials/tests to be accurate or valid. Someone else should get the same results in the exact same trial/test.
• ? If you only did the experiment 1 time, would it be accurate – or valid? Why?
Experimenting IS Important in Science