# Angular acceleration of a rod about different points [closed]

1)Suppose a rod is hinged, such that it is free to rotate about one of its edges. Now, the rod rotates with an angular acceleration α under the influence of a force F applied on the other end. We can find out α easily with the torque equation (Given that mass & length of rod is m & L). Now in this condition, if we apply torque equation on the COM of the rod, the angular acceleration that we have here is same.

Note: $F_1$ & $F_2$ are the forces provided by the hinges.

2) Now almost the same case, the only difference is that now, the force ‘F’ is acting on the COM, and we’ve to find angular acceleration of the rod about a)hinges b)the other end.

Why is the angular acceleration different? Doesn’t it has to be the same?

## closed as off-topic by Emilio Pisanty, Kyle Kanos, Jon Custer, stafusa, ZeroTheHeroJul 8 '18 at 2:59

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• Hi, welcome to Physics SE! Please don't post formulae as pictures, but use MathJax instead. MathJax is easy for people on all devices to read, and can show up clearer on different screen sizes and resolutions. – user191954 Jul 5 '18 at 6:02
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