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 Discussion: Understanding Distance, Speed, and Time Relationships Using Simulation Software tool Topic: Runners Activity: Some Observations Related Item: http://mathforum.org/mathtools/tool/13171/

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 Subject: RE: Runners Activity: Some Observations Author: ihor Date: Jun 26 2006
Chris wrote:
The distance between 0 and 10 on the time scale is not the same as the
distance between 0 and 10 on the position scale.  This means that while it
is
easy to make parallel lines, it is extremely difficult to make perpendicular
lines.

Ihor writes:
Especially since you are trying to do it in an arena where the x and y units are
not the same. The usual way to get linear equations to be perpendicular is to
have one slope be the negative reciprocal of other. With the limitation of the
stepping that only works when the step size is 1, but only if the X and Y unit
intervals are the same.

Interesting!