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Acceleration due to Gravity

1. Connect the datalogger interface to a PC with the software installed.

2. Connect the photogate to the appropriate channel of the interface.

3. Screw the aluminum rod into the hole at the end of the desk.

- Figure 1-


Clamp the photogate to the aluminum rod, as shown in Figure 1, approximately 60cm from the surface of the table.
The photogate that will be used in this experiment consists of an infrared light-emitting diode and a photodetector mounted on a bracket as shown in the photograph to the right. The voltage across the photodetector depends on the intensity of the light incident upon it.
By monitoring the photodetector voltage, the interface can sense whether the light path from the LED to the detector is blocked or not. The datalogger software can record the times at which the detector becomes blocked and unblocked.

5. Place a box with shredded paper directly under the photogate to absorb the impact of the picket fence when it lands.

6. Start the software to collect data.

7. Hold the picket fence so it is vertical with the bottom edge of the first stripe approximately 5cm above the photogate and drop the picket fence through the photgate.

8. After the picket fence drops, stop the collection of data.















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