One possible variable we weren't able to account for was. Our next closest trial was using 2 rubber bands and pulling the throwing arm back 6 cm because the marble landed 315 cm away. According to our data, using 3 rubber bands and pulling the throwing arm back a distance of 4 cm resulted in a throwing distance of 300 cm. To keep the mass of the projectile the same, we used the same marble with a mass of 4.5 grams for the entire experiment. First, our team used a metric ruler to mark centimeters 1-6 on the "A" frame of our catapult. For example: To launch a catapult 300 cm, students must be aware of the distance the throwing arm gets pulled back in centimeters and the number of rubber bands. Reasoning with the collected evidence: Students are then expected to be able to use the evidence they collected to support their claim. They collect data and create a data table.
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