I am a Physics teacher. I made a linear track of length 2m with 400 holes(two rows of 1mm dia). Somewhere I read household vacuum cleaner can be used as a blower. But it does not create sufficient pressure to lift the cart. What should be the specifications of the blower which can be used? Any suggestions for mass and material of the cart? I am using cart made of aluminium. Sakthivel, Coimbatore, India.