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Graphing
To look at the relationship between wheel radius and effort force,
use the data from Table 2 to complete the graph in your lab packet.
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What happens to the effort force as the radius increases?
Use complete sentences to record your answer in your lab packet.
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Do your results match your predictions?
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Record a comparison between your predictions and your results in your
lab packet.
Let's take a closer look at this wheel and the attached screw (axle)
to get a better understanding of what is happening.
We can think of the wheel and axle as a specialized lever.
Click on the wheel to see this relationship.
Recall from the lever activity that as the length of the effort arm of a
lever is increased, the effort force needed is reduced.
- Does this match the results you found when the size of the
wheel was changed?
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As the radius of the wheel increases, what happens to it's circumference?
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How does this change the distance the handle moves to make one
full rotation?
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What would you gain if you applied the effort force at the axle instead
of at the outside of the wheel?
- REMEMBER Fe X De = Fr X Dr
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