A discussion of Lagrangian and Hamiltonian dynamics is presented at a level which should be suitable for advanced high school students. This is intended for those who wish to explore a version of mechanics beyond the usual Newtonian treatment in high schools, but yet who do not have advanced mathematical skills.

The aim of this study was to evaluate the prevalence, behavioural patterns, and determinants of smoking among a large sample of high-school students from Porto, the second largest city in Portugal, information on sociodemographic characteristics and personal history of tobacco, alcohol, coffee, and illicit drug use was obtained from 2974 students, aged 12-19 years (48.7% female, 51.3% male), us...

BACKGROUND Premenstrual syndrome (PMS) is a common health problem among adolescents. OBJECTIVE To assess the prevalence of PMS in Thai high school students. MATERIALS AND METHODS This was a prospective study conducted among menstruating high school students in Khon Kaen, Thailand, from September to December, 2015. Participants were asked to prospectively complete an anonymous questionnaire,...

Although cigarette use by adolescents is declining, emerging tobacco products are becoming increasingly popular and youth may use more than one type of tobacco product. The purposes of this study were: (1) to assess patterns of poly-tobacco use among a representative sample of high school students and (2) to determine how beliefs correlate with poly-tobacco use. Data came from the 2013 North Ca...

background: this study sought the relationship between social support, mental health and demographic factors in new students of tehran university (2005-06). methods: this cross-sectional descriptive study enrolled 2916 university students. subjects were evaluated using demographic questionnaire, general health questionnaire-12 and social support scale. statistical analysis was performed by anov...

the present study pursued two goals: first, to discover the subscales underlying the teacher status scale (tss); and second, to reveal the status of the teachers of persian, arabic, and english in iranian junior high school students’ perceptions in order to determine the relative roles of national, religious, and western influences in the identity construction of the students. the data was coll...

OBJECTIVE To determine seatbelt use of teenage drivers arriving at high schools in the morning and at evening football games compared with belt use of adults driving teenage passengers to these events, and teenage passenger belt use depending on whether they were being driven by another teenager or an adult. METHODS Unobtrusive observations of belt use were made at 12 high schools in Connecti...

Face-to-face contacts between individuals contribute to shape social networks and play an important role in determining how infectious diseases can spread within a population. It is thus important to obtain accurate and reliable descriptions of human contact patterns occurring in various day-to-day life contexts. Recent technological advances and the development of wearable sensors able to sens...

OBJECTIVE The purpose of this study was to investigate school bullying among public high school students in Turkey. METHOD This study used a survey to examine different aspects of bullying in schools. The participants (N = 692) were students chosen from five state high schools in Ankara in the 2000-2001 academic year. A self-administered questionnaire of 28 single or multiple-choice questions...