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Apparent weight



On David Bowman's query about stockholders buying power from falling
water: Where is there a problem there? There seems to be no room for a
fictitious force. The water hits say a turbine blade with a very real
force, and the turbine blade exerts an equal and oposite force on the
water. No one debates that these are real forces. A problem would arise
if one were to introduce a third "force" with no third law counterpart, as
people do when they invent an outward force in a centrifuge pressing them
against the wall.