1. The problem statement, all variables and given/known data I am about to do an experiment where we masure the average speed of a cart released from the top of an inclined plane that has little friction (air track). The speed measurement is done by a photo gate. This is repeated a hundred times. 2. Relevant equations I need to come up with a way to check how the air flow from the air track affects the movement of the cart. More accurately - I need to check how to air flow affects the random error of the speed measurements. 3. The attempt at a solution I could calculate the difference between theory and experiment and find out how everything other than plane's friction and problems' parameters affect the movement. But I cannot isolate the air flow. Any ideas?