To investigate relationships between distance, velocity, time and acceleration
for a cart rolling down and incline plane.
CBL / TI-82
Dual Photogate Adapter
1- Connect Photogates to photogate-CBL adapter
2- Connect CBL to TI-82
3- Select Prgm- Timer
4- Select Pulse mode for timing mode
1- Hit enter to ready CBL for data collection.
2- Postion object at starting position (Just before it breaks the beam.)
3- Release object.
4- Record time in data table.
5- Hit enter and choose  yes, unless you are on last trial.
6- Repeat for each distance
This is just one example of how the classical Galileo's Incline Plane experiment may be completed using the CBL.
Some suggestions for other ways to collect data:
1) Use Gate mode, choose two gates and have a flag 5.0 cm long so that the two times recorded are the time it takes the flag to pass through the photogate at each position. Using this data the students can find the initial velocity and the final velocity.
2) Use Motion mode, and then use Smart Pulley selection in order to collect data for a cart sliding down an incline.
3) Use any of the first two methods for a ball rolling
down an incline.
Some suggestions for analysis:
1) Instead of using the TI-82, the students can use any graphing or spreadsheet program in order to analyze the data including MS Excel, Vernier's Graphic Analysis or Logger Pro, or any other package.
2) The students could be given more instruction on what type of graph the are to get, for instance tell them it is a quadratic.
3) Another interesting approach use to have the students use the data to calculate the value for acceleration along the incline and compare that to the value = g * sin q or to the value of acceleration calculated for a different version of lab with incline at the same angle.
4) Students may also want to compare results using
CBL to results calculated using a different method, stopwatch, waterclock,
or ticker tape timer.