"Ian" wrote in message
ups.com...
On 14 Oct, 17:18, "Bill" wrote:

Read this about lift:

http://home.hccnet.nl/m.holst/LiftDrag.html

Particularly the part about "by definition lift does NOT do work".

What force do you think does work against gravity to allow aeroplanes
to ascend?

Ian


Work = force x distance