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From the point of view of non-professional physics, I can apply a
force and get an acceleration.
I cannot apply an acceleration and get a force.
The present does not seem to me to be an opportune time to enter into
the investigation of the cause of the acceleration of natural motion,
concerning which various philosophers have produced various opinions
.... Such fantasies, and others like them, would have to be examined
and resolved, with little gain. For the present, it suffices .... to
say that in equal times, equal additions of speed are made.
"Hypotheses non fingo."
If I throw a ball in the air, I feel it’s reasonable to say thatMost of the time when I throw a ball, it goes /up/ for a while
something “causes” it to come down.