Hope I can visualize this for you, it might be difficult. There is a (hard, solid) rod which is connected to an axle on one end (allowing it to swing freely around in a complete circle). I know that when the rod is at a steeper angle (almost vertical), the rods acceleration is less than when it is horizontal. How can you calculate the difference in acceleration between different angles? I'm not looking for a perfect calculation (mass is unimportant or 1, and length doesn't matter), I'm just sort of looking to see if the difference (or acceleration of acceleration) is linear or exponential?
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