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Point Particle
A point particle, ideal particle or point-like particle (often spelled pointlike particle) is an idealization of particles heavily used in physics. Its defining feature is that it lacks spatial extension; being dimensionless, it does not take up space. A point particle is an appropriate representation of any object whenever its size, shape, and structure are irrelevant in a given context. For example, from far enough away, any finite-size object will look and behave as a point-like object. Point masses and point charges, discussed below, are two common cases. When a point particle has an additive property, such as mass or charge, it is often represented mathematically by a Dirac delta function. In classical mechanics there is usually no concept of rotation of point particles about their "center". In quantum mechanics, the concept of a point particle is complicated by the Heisenberg uncertainty principle, because even an elementary particle, with no internal structure, occ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collage Of Point Particles
Collage (, from the , "to glue" or "to stick together") is a technique of art creation, primarily used in the visual arts, but in music too, by which art results from an assembly of different forms, thus creating a new whole. (Compare with pastiche, which is a "pasting" together.) Collage may refer to the technique as a whole, or more specifically to a two-dimensional work, assembled from flat pieces on a flat substrate, whereas Assemblage (art), assemblage typically refers to a three-dimensional equivalent. A collage may sometimes include Clipping (publications), magazine and newspaper clippings, ribbons, paint, bits of colored or handmade papers, portions of other artwork or texts, photographs and other found objects, glued to a piece of paper or canvas. The origins of collage can be traced back hundreds of years, but this technique made a dramatic reappearance in the early 20th century as an art form of novelty. The term ''Papier collé'' was coined by both Georges Braque a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
