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toOne experiment I try every
year is using a tilted air track to study accelerated motion and in part
measure the acceleration due to gravity. This never works very well (the
technique requires a photo-gate to be triggered AS SOON AS the cart starts
to move down the incline and that is difficult to set up properly).
If the technique has an obvious flaw in requiring a difficult-to-achieve
setup, why use it? There are many other ways to measure g using a
photogate, and they work very well.