WORK AND ENERGY-Practical
PROCEDURE
The apparatus consists of the linear air track used in previous experiments and two photogates to measure the speed of a glider at two fixed points on the track. A photogate is a photocell and light source connected to an electronic timer in such a way that whenever the light hitting the photocell is interrupted, the timer is turned on. The timer is turned off as soon as the light again hits the photocell. Two such photogates are placed across the air track at two points A and B. The light hitting the photocell is interrupted by the glider. As the glider passes through each gate, the transit time is measured. From these measurements the speeds of the glider at points A and B are calculated.
2. In this experiment, it will be necessary to make two successive measurements of the time interval required for a glider to pass through a photogate.The two photogates should have their signal cables connected to DIG/SONIC 1 and DIG/SONIC 2 of the DataLogger interface. Turn on the interface with the switch, and open the Two-Gate Timer link.
3. Set up a photogate at two points, A and B, at about 30 cm from each end of the track.
4. Make sure that gate #1 (the one connected to DIG/SONIC 1) is at the higher position, point A. Hit Collect in the LoggerPro window to begin taking data
6. Measure and record the length L of the glider and the distance d between the photogates each to within 1 mm. Record this data on the Worksheet in cells F9 and F11, respectively.