|Motion is the distance one object moves
That seems easy enough, except for one fact. Everything is moving. You may seem to be sitting still
in front of your computer, but both you and your computer is moving through space.
So before you can measure how far something moves you have to establish a reference point.
|Are the stairs moving under the
motorcycle, or is the motorcycle
moving over the stairs?
The answer depends upon your
|The reference point is the thing
that you measure motion
You may want to think of it as
the thing that is standing still.