EGR 1301 Lecture Notes - Lecture 29: Gravitational Energy, Air Compressor, Joule
23 Dec 2016
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Different forms in which energy can be found: potential, kinetic, internal, chemical, nuclear. The ultimate usefulness of stored energy depends on how efficiently the energy can be converted into a form that produced a desirable result. M = mass in kg or lbm. Gl= local acceleration of gravity in m/s^2 or ft/s^2. H = height in m or ft. Unit for pe is newton-meters (joules) or ft*lbf. Datum plane: for pe, sea level for example, for ke, earth"s velocity for example. Ke= kinetic energy, in newton-meters or joules: ke is equal to the energy required to accelerate the object from rest to its given velocity. Internal energy symbol u (?) p. 361: the energy possessed by the molecules as a composite whole is called internal energy. Work: when there is an imbalance of forces and movement against some resistance, mechanical work is performed according to the relationship, w=fd. The force is in the direction of movement.
