1. The composition and motion of a pendulum can be described in terms of four measurable quantities. Independent Variables Mass Length Amplitude Dependent Variable Period On which of the independent variables is the period dependent? Only two variables can be investigated at a time. Period versus Mass Length & Amplitude constant Period versus Amplitude Length & Mass constant Period versus Length Mass & Amplitude constant

2. Experimental Set-Up As the pendulum swings the CBR emits sound waves which reflect off of the pendulum and return to the CBR. The CBR calculates the distance to the pendulum and sends the data to the TI-83 which then plots the position of the pendulum versus time.

3. CBR / TI-83 Set-UP Connect the CBR to the TI-83 Press: APPS Press “4”CBL/CBR Press “Enter” Press “2” Data Logger

4. Data Logger Set-Up Press: Enter

5. CBR/CBL Set-Up continued Press “2”CBR After CBR-CBL link has been tested: Press: “Enter” After “Status OK”: Press: “Enter” When you are ready to begin taking data” Press: “Enter” After data collection is complete the TI-83 will plot a graph of the pendulum’s position versus time.

7. 50 100 150 When you have completed Trials A-1 through A-3 press “Enter” and repeat CBR / TI-83 set-up to take a new set of data with the next amplitude.