The magnitude of the downward force that acts on section a in the concept of tension is F = T.
A force simply means an influence that can bring about the change in the motion of an object.
From the complete question, at point 1, there's a downward force. Also, the tension in the rope is given as T.
Therefore, the magnitude of the downward force that acts on section a in the concept of tension is F = T. This is expressed in terms of tension.
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