The modern world is rich with examples of complex machines whose workings are seldom understood. 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.
Students often believe that all machines produce much more work than their human operators put in. This view is consistent with their experiences of most powered mechanical devices e.g. chainsaws, electric power tools and hydraulic excavators.
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Explanation:
The modern world is rich with examples of complex machines whose workings are seldom understood. 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.
Students often believe that all machines produce much more work than their human operators put in. This view is consistent with their experiences of most powered mechanical devices e.g. chainsaws, electric power tools and hydraulic excavators.