General Law
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-287
2025-11-25
44
We have seen that both friction and collision give rise to heat. The work required to overcome the friction in a machine is, from the mechanical standpoint, lost work; in reality it is work transformed into heat. The relation between mechanical work and heat was investigated by Joule, who established the following principle: The disappearance of a certain amount of mechanical energy produces an equivalent amount of heat. The converse of this law is equally true: The disappearance of a certain amount of heat produces an equivalent amount of mechanical energy.
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