Below is a strobe photograph of two balls rolling (to the right)
parallel to each other on two tracks. Students are asked to determine
which, if either, of the two balls is moving faster.
Since both balls cover the same distance
between each strobe flash (i.e. time interval), they are travelling
the same speed.
Below is a strobe photograph of two balls rolling (to the right)
parallel to each other on two tracks. Students are asked to determine
which, if either, of the two balls is moving faster.
Since the blue ball covers more distance
than the red ball between each strobe flash (i.e. time interval), the
blue ball is moving faster.
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