The basic purpose for which most simple machines are designed is to reduce the effort (force) required to perform a simple task. The Romans have a similar understanding of the word ‘machina’ which means ‘trick’ or ‘device’. The Greek word ‘machos’ means ‘expedient’ or something that ‘makes work easy’. The word machine has origins in both the Greek and Roman languages. Research: Hapkiewicz (1992), Bryan, Laroder, Tippins, Emaz & Fox (2008), Meyer (1995), Norbury (2006) Scientific view Many students also have difficulty in identifying or explaining these experiences to others and rarely identify parts of the human body, such as the arms or legs, as composed of levers. Although most students will have common experiences of the use of simple machines like levers and pulleys, few will have any understanding of why their design may provide an advantage or how they should be best employed. Students’ everyday experiences seldom acknowledge devices like levers, inclined planes, wedges and pulleys as being types of ‘simple machines’. chainsaws, electric power tools and hydraulic excavators. This view is consistent with their experiences of most powered mechanical devices e.g.
Students often believe that all machines produce much more work than their human operators put in. Students (and many adults) commonly use the word ‘machine’ to describe complex mechanical devices powered by an engine or electric motor and designed to perform useful labour saving tasks. The modern world is rich with examples of complex machines whose workings are seldom understood. Contrasting student and scientific viewsĬontrasting student and scientific views Student everyday experiences.
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