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A simple apparatus for an experiment often performed during introductory lectures on free fall is described. Collected data of the free fall times are given and the standard calculation of the acceleration of free fall g including error evaluation is presented. The obtained value for g is compared to values given by International Gravity Formula, and to experimental results for the location in Zagreb, where this experiment is performed, as well as values found in the literature. Calculations of corrections and contributions due to resistive forces of the medium, both linear and quadratic in velocity, as well as buoyancy and inertial forces in non-inertial reference frames are included and thoroughly discussed. 相似文献
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Jennifer G. Cromley Tony Perez Theodore W. Wills Jacqueline C. Tanaka Erin McNamara Horvat Emily Tancredi-Brice Agbenyega 《Contemporary educational psychology》2013
In laboratory studies, induced stereotype threat shows negative effects on academic performance and learning. Is the relation between stereotype threat and grades robust in naturalistic settings, specifically in introductory STEM courses? We gathered data on two new measures we term race and sex stereotype bias, which were administered four times over the course of introductory chemistry and biology courses for STEM majors (N = 1358). Patterns of growth for all stereotype bias measures showed a discontinuous pattern, with increases during each semester (fall and spring) and decreases between semesters. For all stereotype bias measures, sophomores scored significantly higher than freshmen, and juniors scored in between. For the sex stereotype bias measure, females scored significantly higher than males. There were no race or sex differences on slopes of growth; though groups began at different levels, all grew at the same rate. There was little relation between grades and stereotype bias when analyzed by race; Asian students showed the largest number of significant – albeit small – correlations (3) and Black students the fewest (none). Correlations between grades and sex stereotype bias were significant and negative – but small – only for males. Results support a point made by Steele in 1997 but neglected since then; stereotype threat may affect only a small sub-portion within stereotyped groups. We argue that variables other than stereotype threat might be better targets for research attempting to explain gaps in STEM achievement and retention. 相似文献
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This research study addresses differences in student perception of the significance of Moodle learning management system (LMS) quality characteristics and differences in student satisfaction in regard to such characteristics. Therein, it has been proven in this study that male and female students are equally satisfied with Moodle LMS quality characteristics and that there is a difference in the significance that students give to these characteristics. When students were observed in regard to their age and year of study, it was found that these groups assigned different significance levels to quality characteristics and were not equally satisfied with them. It was also found that there is a substantial statistical difference in the significance students gave to quality characteristics and in student satisfaction itself, according to how much time they spent using the Moodle application, which is also noted as one of the most important aspects of the research conducted. A further analysis of the variables demonstrated that the following components of quality characteristics were more important to female students: average waiting time for a response, feedback quality, material thoroughness, material clarity, website user-friendliness, cooperation diversity, and material quantity. 相似文献