9.      Test your predictions. Start the data acquisition by clicking REC.

10.At the prompt, hit return to enter the depth submersed to be 0.0

     cm. This value will be entered in the Table, along with the

     calculated weights.

11.Pour water from the pitcher into the container until the level is

     1cm above the bottom of the rod.

12.Enter the depth. Ideally, this will be 1.0cm, but enter the actual depth.

12.Continue incrementing the depth in 1cm steps, until the object is fully submersed. For the last value, enter the total length of the rod.

13.Stop the data acquisition.

14.Remove the Aluminum rod from the force sensor and pour the water from the container back into the pitcher.

15.Repeat the experiment with the plastic rod. Since this object will float, insert the small section of clear plastic tubing into the eyelet at the top of the plastic rod to keep it from floating up.

ANALYSIS:

Carry out the following analysis for each of the rods:

1.    Make a graph of the Object weight on the vertical axis vs. the Fluid weight on the horizontal axis.

2.    Find the slope of the curve using the Statistics/Curve Fit/Linear fit. Compare to the predicted slope = -1.

3.    From the Object weight when fully submersed, determine the rod density.