In physics, fall-force or fall-kraft, is a force that results from the spatial separation of bodies. [1] The term was conceived in 1842 by German physicist Robert Mayer, introduced as a replacement for gravity, that accounts for the mechanical equivalent of heat, namely that heat can produce motion, and that motion can produce heat, and that the two are interconvertable and transformable.

1. Shachtman, Tom. (1999). Absolute Zero and the Quest for Absolute Cold (pg. 86). New York: Mariner Books.

Further reading
● Lindsay, Robert. (1973). Julius Mayer, Prophet of Energy (fall-force, 17+ pgs.). Pergamon Press.
● Helm, Georg. (2000). The Historical Development of Energetics (fall-force, 5+ pgs.). Kluwer.
● Coopersmith, Jennifer. (2010). Energy, the Subtle Concept (fall force, pgs. 248-49). MIT Press.

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