Reaction time

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How to play

Students measure their reaction time by catching a ruler dropped unexpectedly by another person, and converting the measurement on the ruler (distance dropped in cm) to a time measurement (reaction time in seconds) using a chart (Ruler Drop Reaction Time chart).

• One student holds the ruler up reasonably high. The zero mark on the ruler is at the bottom.

• The reacting student places finger and thumb at the bottom of the ruler, not touching but ready to grab.

• At an unpredictable time, the first student drops the ruler.

• The reacting student catches it between finger and thumb, and reads the distance below the thumb.

• The number of seconds for the reaction time is determined by reading the chart.

• Students record their reaction times, and then to make a number line showing the reactions times of their group members. Assist with making and understanding the number line as required.

• Ask students to reflect in their books on what they have learned about reaction times. For example:

  • Circle in colour your best reaction time. Write a statement which explains the reason why this is your best reaction time so far.

  • What is your best estimate of your own reaction time?

  • Do you think the test of reaction time that you used is a good one?

  • How does your reaction time compare with others in your group?

Variations

• Use the online reaction test

Adapted from: reSolve