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hi its mr. Reece from Malmesbury science and Im here to show you how to do the a-level physics practical determination of G via a free-form method now there are a few ways that you can do this but the way the idea is with a piece of card and a light gate or a photo gate here is my light gate here every time something passes in between the beam the datalogger that its connected to starts timing so effectively this is just a posh stop clock it times how long it takes for the card to go through the beam then calculate speed in order to do that it needs to know distance or length and so you need to put in the length of the card that is the length that is falling through the light gate into your datalogger minus 10 centimeters long thats actually a folded piece of card to be 10 centimeters altogether with a bit of blue tank at the bottom and then just seal together with some blue tail white blue tack at the bottom well its to make it bottom-heavy the best place that you would want to