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On 10-Nov-08, at 7:57 PM, Bernard Cleyet wrote:
This clip (below) was posted (on another list). I find it misleading
-- am I incorrect?
My take on it is that most demonstrations of Newton's First Law are
actually better described as demonstrations of impulse, where delta_t
is very small, or F is small (as is the case in this video, rolling
friction is small). I'm thinking of the "whipping the tablecloth off
the table" trick, where there is actually a force applied to the
dinnerware, but the time is short so nothing gets moving too fast.
Mike