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Apr 25, 2015 at 13:07 comment added Rainer Blome @Abc2000ro Ideed I do not answer "an increasing force", which might be interpreted as "continuously increasing". I answer "a force that changes from zero to something". With a suitable setup, you can turn some forces "on" (or "off"). For example in a trigger mechanism, or when a spring hits an end stop, or using electrical current. Since the force jumps, its derivative is not defined.
Apr 24, 2015 at 9:20 comment added Abc2000ro @Rainer Blome. In Physics you learn that a force is causing an acceleration. Ok, but then what is causing a jerk ? You cannot answer "an increasing force", because then what about the infinite derivative of position ? Is it caused by an infinite increasing force ?
Apr 22, 2015 at 20:21 comment added Rainer Blome Think of why acceleration happens. It is caused by something. Can you turn that on or off?
Apr 21, 2015 at 9:35 comment added Abc2000ro Why can the acceleration be discontinuous ?
Apr 11, 2015 at 12:28 history edited Rainer Blome CC BY-SA 3.0
Made answer more explicit.
Apr 8, 2015 at 9:43 history answered Rainer Blome CC BY-SA 3.0