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"Simple machines."
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Simple machines
\"Describes how simple machines are used in construction and how they make work easier. Includes experiments\"--Provided by publisher.
Book
Industrial robots application and collaborative governance of pollution reduction and carbon reduction
The green and intelligent transformation of the manufacturing industry has become the focus of attention in various countries. Through the analysis of China’s empirical data, this paper found that the application of industrial robots can effectively reduce the emission intensity and total emission of industrial carbon dioxide and sulfur dioxide to promote green development, so as to realize the collaborative governance of reducing environmental pollution and carbon emission. In terms of mechanism, industrial robot applications play a role by improving capacity utilization, realizing economies of scale, attracting foreign investment and promoting biased technological progress, so as to realize the collaborative governance of reducing environmental pollution and carbon emission. Further analyses find that the application of industrial robots made technological progress tend to use capital factor, save energy and labor factors input, and the industrial structure optimization plays a positive moderating role in it. Through LMDI decomposition, it is found that the current production mode of “simple machine replacing human” can’t reduce pollutant emissions, and it is necessary to give full play to the productivity improvement, technological progress, factor substitution, and foreign capital introduction brought by robot applications to promote the collaborative governance of reducing environmental pollution and carbon emission.
Journal Article
Simple machines
\"Machines help make work easier, like when you need to lift something heavy or reach way up high. There are six simple machines: the lever, the wheel and axle, the pulley, the ramp, the wedge, and the screw. Can you adjust a seesaw to lift an elephant? What happens when you combine two or more simple machines? Read and find out!\"--Amazon.com.
Book
Frictional Cohesive Force and Multifunctional Simple Machine for Advanced Engineering and Biomedical Applications
A new, simple machine was developed to address a long-standing challenge in biomedical and mechanical engineering: how to enhance the primary stability and long-term integration of screws and implants in low-density or heterogeneous materials, such as bone or composite substrates. Traditional screws often rely solely on external threading for fixation, leading to limited cohesion, poor integration, or early loosening under cyclic loading. In response to this problem, we designed and built a novel device that leverages a unique mechanical principle to simultaneously perforate, collect, and compact the substrate material during insertion. This mechanism results in an internal material interlock, enhancing cohesion and stability. Drawing upon principles from physics, chemistry, engineering, and biology, we evaluated its biomechanical behavior in synthetic bone analogs. The maximum insertion (MIT) and removal torques (MRT) were measured on synthetic osteoporotic bones using a digital torquemeter, and the values were compared directly. Experimental results demonstrated that removal torque (mean of 21.2 Ncm) consistently exceeded insertion torque (mean of 20.2 Ncm), indicating effective material interlocking and cohesive stabilization. This paper reviews the relevant literature, presents new data, and discusses potential applications in civil infrastructure, aerospace, and energy systems where substrate cohesion is critical. The findings suggest that this new simple machine offers a transformative approach to improving fixation and integration across multiple domains.
Journal Article
Simple machines : inventions that changed the world--and the science behind them
Leo teaches his cat Pallas all about simple machines by applying his knowledge of science to their stone age world. Engaging illustrations and stories provide a fun introduction to science concepts, including wheel and axles, levers, pulleys, wedges, screws, and more. Information boxes accompany each story to explore real applications of simple machines in the natural and designed world.
Book
Evaluating video-based PBL approach on performance and critical thinking ability among Ugandan form-2 secondary school students
In recent years, there has been a growing emphasis on innovative teaching methods in secondary education as educators seek to enhance students' critical thinking abilities and motivation to lean. This research focuses on evaluating the impact of a video-based Problem-Based Learning (PBL) approach on the performance and critical thinking ability of Ugandan Form-2 secondary school students. We assessed students' performance and motivation for critical thinking using a test and their motivation using a motivational scale. The quasi-experimental design involved 144 students selected from four schools in the Sheema District. All students were pretested before the experimental group underwent a video-based PBL intervention and posttested after the intervention. Data entry and analysis were conducted using MS Excel 2016 and SPSS v.25. Inferential statistics revealed a statistically significant difference in critical thinking ability before and after learning the unit on simple machines in physics. Additionally, a positive motivation to learn physics was statistically proven after the intervention. Notably, students from government schools exhibited diverse performance, while private school students showed greater improvement and motivation after the instructional intervention. In conclusion, the results demonstrate that video-based PBL is an effective method for teaching physics and fostering motivation to learn the subject. Consequently, we recommend that teachers incorporate this approach into their daily teaching practices and call upon stakeholders to support the implementation of these resources in the classroom.
Journal Article
Wedges at work
\"Describes wedges, including the history, function, and everyday uses.\"-- Provided by publisher.
Book
The Design of a Teaching-Learning Sequence on Simple Machines in Elementary Education and its Benefit on Creativity and Self-Regulation
In this study, the process of design, implementation, evaluation, and redesign of a Teaching-Learning Sequence (TLS) on simple machines for students of 9-12 years old is shown according to the principles of Design Based Research. The aim is to create a TLS that satisfactorily addresses the conceptual difficulties inherent to the object of study and that succeeds in fostering self-regulation skills and creativity. Both qualitative (focus group, semi-structured interviews, students’ reports, and teacher’s class notes) and quantitative instruments (a validated questionnaire and an ad hoc one with content validation by experts) are used. The statistical analysis of the questionnaires and the narrative analysis of the qualitative instruments have been triangulated. The results show that students manage to address the conceptual and procedural difficulties of the object of study while developing emotional (enjoyment and self-efficacy) and cognitive (metacognition) self-regulation skills, as well as creativity related to the scientific and artisan domains.
Journal Article
Curious Pearl tinkers with simple machines : an augmented reading science experience
\"Curious Pearl and her brother don't like chores. They'd rather play with their kitten. But Dad looks serious, so Pearl and her brother come up with a solution. They build a contraption to help them with their chores. As they build, Pearl teaches her brother all about simple machines. Free bonus video content through the Capstone 4D augmented reality app enhances the science experience.\"-- Provided by publisher.
Book
Disparities in voltage-sensor charge and electromotility imply slow chloride-driven state transitions in the solute carrier SLC26a5
Outer hair cells (OHCs) drive cochlear amplification that enhances our ability to detect and discriminate sounds. The motor protein, prestin, which evolved from the SLC26 anion transporter family, underlies the OHC’s voltage-dependent mechanical activity (eM). Here we report on simultaneous measures of prestin’s voltage-sensor charge movement (nonlinear capacitance, NLC) and eM that evidence disparities in their voltage dependence and magnitude as a function of intracellular chloride, challenging decades’ old dogma that NLC reports on eM steady-state behavior. A very simple kinetic model, possessing fast anion-binding transitions and fast voltage-dependent transitions, coupled together by a much slower transition recapitulates these disparities and other biophysical observations on the OHC. The intermediary slow transition probably relates to the transporter legacy of prestin, and this intermediary gateway, which shuttles anion-bound molecules into the voltage-enabled pool of motors, provides molecular delays that present as phase lags between membrane voltage and eM. Such phase lags may help to effectively inject energy at the appropriate moment to enhance basilar membrane motion.
Journal Article