For closed systems with no external source or sink of energy, the first law of thermodynamics states that a system's energy is constant unless energy is transferred in or out by mechanical work or heat, and that no energy is lost in transfer. This means that it is impossible to create or destroy energy.
GROGAN. The Irish name Grogan is derived from the native Gaelic O'Gruagain Sept that was initially located in County Roscommon but which became widely dispersed. The name is derived from a Gaelic word meaning 'fierceness'. Grugan, Groggan, Groogan and O'Grogan are among the variants of this name.he Irish name Grogan is derived from the native Gaelic O'Gruagain Sept that was initially located in County Roscommon but which became widely dispersed.
grutch (v.) c. 1200, grucchen, to murmur, complain, find fault with, be angry, from Old French grouchier, grocier to murmur, to grumble, of unknown origin, perhaps from Germanic, probably ultimately imitative. Meaning to begrudge is c. 1400. Compare gruccild (early 13c.) woman who complains, from grutch + suffix of