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  1. P

    A question regarding momentum

    It is the moment and I was indeed ignoring the weight of the bar itself since it shouldn't have influence on the system equilibrium. Thanks a lot for that explaination. it's very helpful.
  2. P

    A question regarding momentum

    There's something I struggle to understand. In the picture I attached to this post , the first drawing is a system with the sum of momentum = 0 (equilibrium). In the second drawing I increase temporarily the force on point A in order to get and angle of 20° compare to the last position and...
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