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John V Jackson replied to James Cunningham:

> >They're using the mathematical description of work.  No vertical
> movement,
> no
> >vertical work.  That doesn't mean no energy has been expended.
> 
> I was aware of that, though isn't it a "physic"-al description?
...
> Since work is force times speed...

Work is the amount of energy changed from one form to another (i.e.
expended).  It doesn't have a direction.  When an object moves, work
is equal to force times distance.

Bill

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