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I hope most people on this list, if they thought about it for a moment,
would agree with the observation that "equality" is symmetric while
"causation" is nonsymmetric.
F = ma is a model which describes the interaction of a force with a
particle, a point mass. You guys are reifying again! Real forces do
cause accelerations. If you've got any mathematically pristine point
masses around to use to check then you may have a problem
determining the causal relation between force and acceleration - if
you succeed in coupling your force to the particle! For extended
objects forces manifestly cause accelerations.