## The Wheel & Axle

#### Graphing - 2::

To look at the relationship between wheel radius and effort force, use the data from Table 2 to complete Graph 2A in your lab packet.

#### Analysis Questions:

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.

3. Recall from the lever activity that as the length of the effort arm of a lever is increased, the effort force needed is reduced. If an increase in the length of an effort arm result in a decrease of effort force, explain why an increase in the radius of a wheel results in a decrease in effort force needed.

4. As the radius of the wheel increases, what happens to it's circumference?

5. How does this change the distance the handle moves to make one full rotation?

6. What would you gain if you applied the effort force at the axle instead of at the outside of the wheel?