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Online Physics Glossary
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Word Meaning Remarks
Fluid Material that flows, i.e. liquids, gases, and plasmas.
Focal length Distance from the focal point to the center of a lens or vertex of a mirror.
Focal point Location at which rays parallel to the optical axis of an ideal mirror or lens converge to a point.
Forbidden gap Energy values that electrons in a semiconductor or insulator may not have.
Force Agent that results in accelerating or deforming an object.
Frame of reference Coordinate system used to define motion.
Fraunhofer lines Absorption lines in the sunís spectrum due to gases in the solar atmosphere.
Frequency Number of occurrences per unit time.
Friction Force opposing relative motion of two objects are in contact.
Fundamental particles Those particles( i.e. quarks and leptons) of which all materials are composed.
Fundamental tone Lowest frequency sound produced by a musical instrument.
Fundamental units Set of units on which a measurement system is based( i.e. meter, second, kilogram, ampere, candela).
Fuse Metal safety device in an electric circuit that melts to stop current flow when current is too large.
Fusion Combination of two nuclei into one with release of energy.
Galvanometer Device used to measure very small currents.
 
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