Classical Mechanics
Mostrando 1-12 de 77 artigos, teses e dissertações.
-
1. Epistemological difficulties in implementing a teaching-learning sequence on the concept of mass
Abstract In this work, we show the results from a research made in a curricular innovation situation, whose main focus was to assess the performance of a teacher which implemented a teaching sequence on the concept of mass. This process began by a revision of the concept of mass in three different frameworks, namely classical mechanics, electromagnetism and
Rev. Bras. Ensino Fís.. Publicado em: 30/09/2019
-
2. Boundary Layer Effects in a Finite Linearly Elastic Peridynamic Bar
Abstract The peridynamic theory is an extension of the classical continuum mechanics theory. The peridynamic governing equations involve integrals of interaction forces between near particles separated by finite distances. These forces depend upon the relative displacements between material points within a body. On the other hand, the classical governing equ
Lat. Am. j. solids struct.. Publicado em: 22/10/2018
-
3. Two helpful developments towards better understanding of adiabatic invariance in classical mechanics
Abstract The topic of difficult understanding of adiabatic invariance in classical mechanics is dealt with in a more understandable way. Using the one-dimensional harmonic oscillator as an example, the goals of this paper are twofold. First, given a first-order parameter variation, the second-order magnitude of the correction to the adiabatic invariant is es
Rev. Bras. Ensino Fís.. Publicado em: 21/09/2018
-
4. Simple but accurate periodic solutions for the nonlinear pendulum equation
Abstract Despite its elementary structure, the simple pendulum oscillations are described by a nonlinear differential equation whose exact solution for the angular displacement from vertical as a function of time cannot be expressed in terms of an elementary function, so either a numerical treatment or some analytical approximation is ultimately demanded. Su
Rev. Bras. Ensino Fís.. Publicado em: 21/09/2018
-
5. The meanings of mass and E = mc2: an approach based on conceptual maps
Abstract In this work, we discuss transformations in the meaning of the concept of mass, which are important to physics teaching, by means of three conceptual schemes, which emphasize visual patterns of knowledge organization. We begin by discussing how the meaning of a physical concept is constructed, through its relations with others. In physical theories,
Rev. Bras. Ensino Fís.. Publicado em: 24/05/2018
-
6. Thermal effects on the stability of circular graphene sheets via nonlocal continuum mechanics
Recently, graphene sheets have shown significant potential for environmental engineering applications such as wastewater treatment. Different non-classical theories have been used for modeling of such nano-sized systems to take account of the effect of small length scale. Among all size-dependent theories, the nonlocal elasticity theory has been commonly use
Lat. Am. j. solids struct.. Publicado em: 2014-08
-
7. Size-dependent thermoelasticity
In this paper a consistent theory is developed for size-dependent thermoelasticity in heterogeneous anisotropic solids. This theory shows that the temperature change can create not only thermal strains, but also thermal mean curvatures in the solids. This formulation is based on the consistent size-dependent continuum mechanics in which the couple-stress ten
Lat. Am. j. solids struct.. Publicado em: 2014
-
8. Fibras cuánticas para sistemas clásicos: introducción a la cuantificación geométrica
In this article, We shall introduce the formalism of canonical quantization called "geometric quantization". Since this formalism let us understand quantum mechanics as a geometric extension of classical mechanics, we shall identify the insufficiencies of the latter that are resolved by such an extension. We shall show that geometric quantization permits us
Sci. stud.. Publicado em: 2013-03
-
9. Quantum realism and quantum surrealism
In this thesis we explore the question: whats strange about quantum mechanics? This exploration is divided in two parts: in the first, we prove that there is in fact something strange about quantum mechanics, by showing that it is not possible to conciliate quantum theory with various different definitions of what should be a normal theory, that is, a theory
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/06/2012
-
10. Comportamento crítico da produção de entropia em modelos com dinâmicas estocásticas competitivas / Critical behavior of entropy production in models with competitive stochastic dynamics
We study kinetic phase transitions and the critical behavior of the entropy production in spin models with nearest neighbor interactions subject to two Glauber dynamics, which simulate two thermal baths at different temperatures. In this way, it is assumed that the system corresponds to a continuous time Markov process which obeys the master equation. Thus,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/04/2011
-
11. Coreografias no problema de N corpos / Choreographies in the N-body problem
O objetivo deste trabalho é a obtenção numérica de soluções periódicas para o problema geral de N corpos sujeitos apenas à atração gravitacional mútua. Em particular, procuramos soluções chamadas de coreografias, que apresentam em comum a propriedade de que todos os corpos se movem sobre a mesma curva. O interesse neste tipo de solução aumento
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/03/2011
-
12. Noções de referencial inercial : um estudo de epistemologia genética com alunos de física
Um dos conceitos mais fundamentais na Física é a de Referencial. Isso porque, para analisar qualquer fenômeno físico, é necessária a adoção de um Referencial. No que diz respeito aos fenômenos clássicos da Física, comumente diferenciam-se dois sistemas de referência: o sistema inercial e o não inercial. Enquanto que para o primeiro são válidas
Publicado em: 2011