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Someone suggested that we not mention "causation" since Newton's Third
Law tells us that the forces between two bodies are simultaneous, and
that causation implies temporal sequence.
if I am standing at the chalkboard and decide to cross the room to look
at a student's work, my body must change its state of motion from rest
to moving at more-or-less constant speed across the room.
The implied acceleration of my body must be due to an external force
acting on my body,
there is no doubt that my volitional thrust against
the floor is causative ultimately of my acceleration.