1.  Open the Worksheet and fill in the header information.

2.  You are supplied with thin rods of the following materials: brass, copper, steel, and aluminum and plastic. Take the brass rod and measure its diameter d with the micrometer and record the value and the estimated uncertainty (least count of the micrometer) in cells B11:B12.

3.  Next, suspend it from the support strings, one at each end. Record the distance between the support strings with the meter stick as the length L and the estimated uncertainty (least count of the meter stick) in cells B13:B14.

4.  Suspend the mass and holder from the center of the rod and place 100 g mass on it. Record the total mass (don't forget the holder) and the estimated uncertainty (least count of the balance) in cells B15:B16.

5.  Open the Young's Timer link. Make sure the photogate is located so that its beam is broken by the rod as it oscillates by displacing the rod and releasing it to oscillate. The photogate icon in the timer application will flash when its beam is interrupted.

6.  When the apparatus is functioning properly, start the rod oscillating by displacing the mass holder and releasing it. Hit Collect on the LoggerPro window. Allow the computer to take data for at least 100 seconds, then hit Stop.

7.  Record the value of the frequency f and the uncertainty as displayed in the timer window in cells B17:B18 on the Worksheet.

8.  Repeat the procedures 2 through 6 for the other rods and record the data on the Worksheet where indicated for each material.