"niruhâ-ye nâgerâneši" (#)
Fr.: "forces non-gravitationnelles"
The forces of jets from a comet's nucleus that can cause a rocket-like effect and alter a comet's direction of motion slightly.
Fr.: force adhésive
The force of → attraction between molecules of different substances; for example, the force between the molecules of a solid and a liquid. When water is poured on clean glass, it tends to spread, forming a thin, uniform film over the surface. This is because the adhesive forces between water and glass are strong enough to pull the water molecules out of their spherical formation and hold them against the surface of the glass, thus avoiding the repulsion between like molecules.
Fr.: force aérodynamique
Fr.: force attractive
Fr.: poussée d'Archimède
From buoy (current meaning) "a float moored in water to mark a location," from M.E. boye, from O.Fr. buie or M.Du. boeye, from L. boia "fetter, chain" + suffix -ant; → force.
Fr.: force centrale
A → force that is always directed toward a fixed point and whose → magnitude depends only on the distance from that point. Mathematically, F is a central force if and only if: F = f(r)r1 = f(r)r/r, where r1 = r/r is a unit → vector in the direction of r. If f(r) < 0 the force is said to be → attractive toward the source. If f(r) > 0 the force is said to be → repulsive from the source. In other words, a central force is one whose → potential, V(r), depends only on the → distance from the source. → Gravitational force and → electrostatic force are central, with V(r)∝ 1/r.
niru-ye markaz-goriz (#)
Fr.: force centrifuge
A force in a rotating reference frame directed outward from the axis of rotation.
niru-ye markaz-gerâ (#)
Fr.: force centripète
The force exerted on an object in → circular motion which is directed toward the center and keeps the body in motion. Centripetal force produces → centripetal acceleration, according to → Newton's second law: Fc = mac. Its direction is always inward along the → radius vector, and its magnitude is given by: Fc= mac = mvt2/r = mω2r.
Fr.: force cohésive, ~ de cohésion
The force of → attraction between the molecules of the same substance.
Fr.: forces collinéaires
A system of two or more forces that lie along the same → line of action.
niruhâ-ye hamras (#)
Fr.: forces concourantes
A system of forces applied to a → rigid body in such manner that their lines of action intersect at a single point. A system of concurrent forces acting on a rigid body can be replaced by an equivalent force applied at the same point. → line of action.
Niruhâ, plural of niru, → force; hamras, literally "coming, reaching together," from ham-, → com-, + ras "coming, comer, reaching," present stem of rasidan "to arrive; to attain" (Mid.Pers. rasidan "to arrive, to mature;" O.Pers./Av. rasa- present stem of ar- "to move, go or come toward;" cf. Skt. ar-, rcchati "reaches;" Gk. erkhomai "to go, to reach;" L. oriri "to rise").
Fr.: forces coplanaires
A system of forces acting on a body that all are in the same plane.
niru-ye Coriolis (#)
Fr.: force de Coriolis
niru-ye Coulomb (#)
Fr.: force de Coulomb
An attractive or repulsive → electrostatic force between objects bearing electric charge, as described by → Coulomb's law. If the charges are of opposite sign, then the force is attractive; if thy are of the same sign, the force is repulsive.
Fr.: force électromagnétique
The fundamental force that is associated with electric and magnetic fields. One of the four fundamental forces of nature, it is carried by photons.
electromotive force (EMF)
niru-ye barqrân (#)
Fr.: force électromotrice
The force, analogous to a pressure, which maintains a flow of electricity through a closed circuit. It is the algebraic sum of the → potential differences acting in the circuit. The unit of electromotive force is the → volt.
niru-ye barqânezâr, ~ barqâkamzur
Fr.: force électrofaible
The force that takes part in an → electroweak interaction.
Fr.: force d'échange
The force that governs the exchange of particles in the interaction between bodies. → exchange particle.
field of force
meydân-e niru (#)
Fr.: champ de force
1) The cause of a change in motion or shape of a body.
From O.Fr. force, from L.L. fortia, from neut. pl. of L. fortis "strong," from forctus, from PIE base *bhergh- "high" (cf. Av. barəz- "high, mount," barezan- "height;" O.Pers. baršan- "height;" Mod.Pers. borz in (the mountain chain) Alborz, and borz "height, magnitude," bâlâ "up, above, high, elevated, height," Lori dialect berg "hill, mountain;" Skt. bhrant- "high;" O.E. burg, burh "castle, fortified place," from P.Gmc. *burgs "fortress;" Ger. Burg "castle," Goth. baurgs "city," E. burg, borough, Fr. bourgeois, bourgeoisie, faubourg).
Niru, from Mid.Pers. nêrok, Av. nairya- "manly, male" (cf. Skt. nárya-), from nar- "man, male" (Mid./Mod.Pers. nar- "male," Skt. nár- "male").