一道典型力学题"一题多解"赏析

对物理问题进行“一题多解”，不仅能使我们掌握相应的几种解题技巧，还可以帮助我们全方位地观察问题，多角度多层次地深入理解物理知识，提高灵活运用物理规律以及数学知识解决物理问题的能力，使我们的思维灵活，解题思路开阔，应变能力增强，下面就一道典型的平抛运动题目，从不同的角度的多种解法，说明“一题多解”在提高学习效益上的积极作用。     

试探物理开放型习题教学

传统的物理习题课教学大多采用低效高耗的“题海战术”，结果害了学生，也苦了教师．怎样才能在习题课的教学中既减轻师生负担，又提高教学效益呢？怎样才能从根本上提高学生对物理问题的解决能力呢？采用开放型习题教学往往会收到意想不到的效果．所谓物理开放型习题是指条件不完备，结论不确定，解题策略多样化的题目．物理开放型习题教学为学生提供了更多的交流与合作的机会，为充分发挥学生的主体作用创造了条件．     

在"说题"、"谈题"、"品题"中提高学生问题解决能力

教育心理学的研究成果表明：学习困难的学生在问题解决中使用策略的水平远远不如一般的学生，他们缺少问题解决的经验并且头脑里没有清晰有序的策略知识。可见，在占有相同知识量的前提下，培养学生问题解决能力需要在“经验”和“有序的策略”上下功夫，通过教学研究与实践，笔者发现教学中特别是习题课教学中，一种“说题”、“谈题”、“品题”的教学方式能在培养学生的“经验”和“有序的策略”上取得实效，并有效地提高学生问题解决能力。     

高中物理习题课有效教学之初探

传统的物理习题课, 一般都是针对某一知识点或某一方法的讲解和训练. 学生花费了很多的精力, 在这 个知识点或方法上虽然有所提高, 但是物理的整体解题能力提高有限. 通过对学生解决物理问题所需技能的分析, 如阅读能力、 画图分析、 物理建模、 书面表达等, 提出了有计划地对这些能力进行专项技能训练的方法, 从而有效地 提高学生的解题能力, 提高习题课教学的有效性     

横看成岭侧成峰

本文以一道运动学题为例, 谈谈“ 一题多解”在物理教学中的应用, 通过一题多解的教学设计激发学生 兴趣, 开拓学生思路, 培养逻辑推理能力和想象力, 进一步培养学生的解题能力. 并结合例题探讨了在一题多解教学 中应该遵循的一些原则     

关于斜面体上物体所受的摩擦力问题的分——“问题导学”模式下的物理习题课教学

本文介绍了“问题导学”模式,并将该模式用于摩擦力习题课教学,笔者能够深切地感到,在物理教学中实施“问题导学”,学生处于积极的思维探索状态,使让学生在问题的分析和解决中得到知识、能力的建构。     

"黑箱"教学中激发学生兴趣的尝试

物理教学中有不少“黑箱”习题,可用于培养发散思维、推理、灵活运用知识的能力．一些学生对“黑箱”问题感到困惑、害怕．怎样在“黑箱”教学中激发学生学习兴趣呢？以下是笔者一节“黑箱”习题课的教学片段．     

物理习题课的设计

通过习题课,可以使学生深化对物理知识的理解,领会物理学中特有的思维方式和基本方法论,培养分析问题,解决问题的能力.一堂好的物理习题课,需要用系统的科学方法去引导和训练学生. 习题课的设计应从如下三方面入手.1 制定明确的目标     

深化概念教学加强能力培养

面对职教院校学生基础知识薄弱，学习中不善于从物理概念出发，又不重视物理过程分析，忽视物理概念和规律的深刻理解等现象．如何加强能力培养已成为物理教学中急待解决的问题．通过多年的教学尝试和总结，我认为加强习题课教学是促使学生掌握基础知识和培养学生开启思路增强能力的重要方法．     

多元化物理习题教学浅探

习题课是一个重要的课型,习题课教学质量的优劣,近则关系到学生初升高的中考物理成绩,远则对学生解决实际问题的能力与习惯有着长久的影响。如何提高初中物理习题课教学的效度?是每一位物理教师都在思考的课题,笔者结合自己多年的教学实践,将自己对该问题的所想、所悟与大家一起分析。     

关于"太阳在银河系中所受引力与到银心距离r的关系"的讨论

讨论了银道面内的引力场强分布和太阳在银河系中所受引力与到银心距离r的关系，指出引力场强g并不是与r的平方成反比，这是由于银河系的大小和形状不能忽略造成的．强调了万有引力定律的适用条件．     

On the predictability of the positions of the convergence zones in the ocean

The disagreement between the experimental and calculated positions of the first convergence zone are known from many publications. The most probable cause for such a disagreement, namely, the incorrect specification of the input data for the calculations, is considered. The lack of simultaneity between the hydrological surveys of the region and the acoustic experiments is emphasized. The experimental data obtained by the author in five ocean regions are presented. These data characterize the diurnal variability of the distance from the source to the nearest boundary of the convergence zone. The relations proposed by different researchers for calculating the sound speed from the temperature, salinity, and hydrostatic pressure are analyzed. It is shown that these relations lead to a substantial difference in the estimated depth dependence of the hydrostatic gradient of the sound speed. The position of the first convergence zone is calculated for the propagation conditions determined by vertical temperature and salinity profiles with the subsequent recalculation of these profiles into sound speed profiles by using eight different formulas known from the literature. It is shown that different formulas lead to different values of the distance to the first zone; this difference is substantially greater than that between the calculations and experiment. The necessity of improving the recalculation relations in view of the experimental data on sound propagation in natural oceanic waveguides, including the data on the actual positions of the convergence zones, is emphasized.     

On the calculation of the bremsstrahlung in the region of the plasma frequency

On the basis of the classical theory of radiation produced in incomplete Coulomb interaction, a formula is derived for the coefficient of the bremsstrahlung of fully ionized plasma. In the region of rectilinear approximation a comparison is made with the results of the quantum formula derived from the Born approximation. Furthermore, the influence of dispersion upon the emission coefficient is taken into account; some relations for the region of dispersion are given.     

Dependence of the Intensity of the Spectral Lines and the Composition of the Sample and the Plasma Parameters of the Unipolar Arc

The investigation was made of the dependence of the intensity of Tl, Ga, Mo, Mg, Mn, Sn, Bi, Ni, Zn, Pt and Au spectral lines and the plasma parameters (temperature T, electron concentration n_e, degree of 6 ionnization α) from concentration of lithium additive.     

Extracting the wavefunction of the LSP at the LHC

We consider associated production of squarks and gluinos with the lightest supersymmetric particle (LSP), or states nearly degenerate in mass with it. Though sub-dominant to pair production of color SU(3)-charged superpartners, these processes are directly sensitive to the wavefunction composition of the lightest neutralinos. Exploiting event-shape variables - including some introduced here for the first time - we are able to identify the composition of the LSP by selecting events involving a single high-pT jet recoiling against missing transverse energy. We illustrate the proposed technique on a set of benchmark cases and propose methods for applying these results in more realistic experimental environments.     

Set the controls for the heart of the Sun

In this paper we describe experiments conducted with high-power lasers that are attempting to replicate, for a very short time and in miniature, conditions found in the Sun. Experiments to date have reached conditions in the outer part of the Sun. To reach the Sun's centre requires compression of material to very much greater than solid density and heating to over ten million degrees. To achieve this, a new class of experiments and a new generation of high-power lasers are required.     

On the Question of the Source of the Apokamp

Technical Physics - The object of this work is the apokamp—a new type of plasma jet, which is formed from a bright offshoot emerging at the bending point of a channel of a high-voltage...