Perhaps it means force and acceleration are related uniformly
but acceleration and position are not simply related and in fact position is the second integral of acceleration
for example:
If force is constant, acceleration is constant.
If acceleration is constant, velocity is a line with constant slope
so then
position is quadratic
if a is constant
v = Vi + a t
x = Xi + Vi t + 1/2 a t^2
Why would a graph of force vs position not be uniform??
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