Prove that momentum is conserved in the collision of two objects in a transfer of energy. Measure the mass and length of the sled using the meter stick and scale. Connect vacuum cleaner to air track and place sleds on air track. Attach photogate timer to air track at strategic locations to get a good reading. Place the sled without the rubber band between the two timers and the other on with the rubber band outside the timers.
Set photogates timers so that they are ready to take readings.
Slide the two sleds together, then log the data for both times. Place one sled between the timers and turn the other sled with the rubber band around so that the rubber band won't hit the other sled. Slide the sled with the rubber band at the sled between the timers and log data. Then repeat without rubber band. Record all numbers.