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PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club The PiXL Club Practical Guide Biology Reaction Time This document contains: Links to YouTube clips showing the practical procedure Information from examination boards AQA, OCR, Edexcel Potential examination questions and answers This resource is strictly for the use of member schools for as long as they remain members of The PiXL Club. It may not be copied, sold nor transferred to a third party or used by the school after membership ceases. Until such time it may be freely used within the member school. All opinions and contributions are those of the authors. The contents of this resource are not connected with nor endorsed by any other company, organisation or institution. Commissioned by The PiXL Club Ltd. November 2016 www.pixl.org.uk The PiXL Club Ltd, Company number 07321607 © Copyright The PiXL Club Ltd, 2016

Required practical – exam boards AQA

Practical procedure: Reaction Time Video 1 Video 2 Click on each of the tabs to take you to a YouTube clip. Please note these are external sites to PiXL, PiXL does not control the content of these sites.

Possible examination style questions A student carried out an investigation into the reactions of a friend using the ruler drop experiment. The mean distance the ruler was dropped was 113mm. Use this equation to calculate the reaction time: List 5 variables which would need to be kept constant in order to gain valid data. The student wanted to see if caffeine had an impact on reaction time. Describe how she could carry out the experiment to test this.

Possible examination style questions answers Use this equation to calculate the reaction time: ANS: 𝟏𝟏𝟑/𝟒𝟗𝟎 = 0.48s

Possible examination style questions answers List 5 variables which would need to be kept constant in order to gain valid data. ANS: Height ruler is dropped from Ruler/ weight of ruler Not using force when dropping it Distance thumb/ hand is from the ruler Laying arm on same surface Using same hand/ using dominant hand

Possible examination style questions answers The student wanted to see if caffeine had an impact on reaction time. Describe how she could carry out the experiment to test this. ANS: Give specific amount of caffeine/ coffee each time Same time between drinking and experiment Valid experiment – see previous question Repeats

Key questions: How could the validity of the experiment be improved? How have you ensured the results are valid? How would you calculate the reaction time from the distance? How many repeats would you do? Describe the potential impact of repeats on reaction time. What impact do you think a lack of sleep would have upon the results? Why do you think charities such as GEM motoring assist produce free cards for people to find out their reaction times? (https://www.motoringassist.com/the-gem-story/leaflets/)

Summary document A summary document is also available on Huddle which contains all the relevant information about this practical from the different examination boards. This document includes practical methods and other potential examination questions