Abstract
Since 1946 there have been a number of studies reported concerning students' understanding of the concept of
speed (e.g., Piaget 1946, Trowbridge 1979). This paper describes one part of a study concerning Year 9·
students' strategies in solving problems which involved comparing the speed of two trolleys given the
starting and finishing position and the time taken for each one. It was found that students used a variety of
strategies ranging from guessing to intuitive use of variables to rather sophisticated uses of ratios and a
calculation. Students also revealed some misconceptions concerning the variables that determine speed. Of
particular interest was the use of time or distance as a determining variable without mention of the other
variable.
ROSS CUTHBERT & JOHN PEGG
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