Forces, stopping and braking

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Question 25
Easy

A group of students are investigating how distraction affects reaction time using the ruler drop test.

A diagram showing two students performing the ruler drop test. One student holds a 30 cm ruler vertically by the top end. The second student's hand is hovered near the bottom of the ruler, prepared to catch it. The fingers of the second student are aligned exactly with the 0 cm mark, which is positioned at the very bottom of the ruler. The scale increases upwards to 30 cm at the top.

Give one reason why it is standard practice to position the 0 cm mark of the ruler at the bottom (between the digit and thumb) rather than at the top of the ruler.

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Forces, stopping and braking Questions

  1. GCSE
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