Ever wondered how quickly you can react when something unexpected...
Biology519 views·Updated 13 Aug 2026·2 pagesUnderstanding Reaction Times - Biology GCSE Practical 7
1
of 2
Setting Up the Reaction Time Test
You'll need a partner for this experiment - one person tests whilst the other measures. Person 1 sits upright on a stool with their dominant arm resting on the table, hand hanging over the edge.
Person 2 holds a ruler vertically so the 0cm mark sits between Person 1's thumb and first finger. When Person 2 drops the ruler at a random moment, Person 1 must catch it as quickly as possible.
The key measurement is where the ruler sits level with the top of Person 1's thumb after catching it. Repeat this several times to calculate a mean reaction time, then swap roles to compare results between different people.
Top Tip: Make sure the person catching doesn't anticipate the drop - it needs to be completely random for accurate results!
2
of 2
Variables and Variations
Your independent variable is the person being tested, whilst the dependent variable is their reaction time measurement. Keep everything else constant - same finger distance, same thumb measurement point, and identical room conditions.
Want to explore further? Try testing how practice affects reaction time by repeating the test many times with the same person. You could also compare dominant versus non-dominant hands to see which reacts faster.
For a real challenge, investigate how substances like caffeine might change reaction times. Have someone drink a measured amount 30 minutes before testing, then compare their results to their normal reaction time.
Remember: The more variables you control, the more reliable your results will be!
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Biology519 views·Updated 13 Aug 2026·2 pagesUnderstanding Reaction Times - Biology GCSE Practical 7
Ever wondered how quickly you can react when something unexpected happens? This required practical lets you measure reaction time using a simple ruler drop test that you can easily do with a partner.
1
of 2
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Setting Up the Reaction Time Test
You'll need a partner for this experiment - one person tests whilst the other measures. Person 1 sits upright on a stool with their dominant arm resting on the table, hand hanging over the edge.
Person 2 holds a ruler vertically so the 0cm mark sits between Person 1's thumb and first finger. When Person 2 drops the ruler at a random moment, Person 1 must catch it as quickly as possible.
The key measurement is where the ruler sits level with the top of Person 1's thumb after catching it. Repeat this several times to calculate a mean reaction time, then swap roles to compare results between different people.
Top Tip: Make sure the person catching doesn't anticipate the drop - it needs to be completely random for accurate results!
2
of 2Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Variables and Variations
Your independent variable is the person being tested, whilst the dependent variable is their reaction time measurement. Keep everything else constant - same finger distance, same thumb measurement point, and identical room conditions.
Want to explore further? Try testing how practice affects reaction time by repeating the test many times with the same person. You could also compare dominant versus non-dominant hands to see which reacts faster.
For a real challenge, investigate how substances like caffeine might change reaction times. Have someone drink a measured amount 30 minutes before testing, then compare their results to their normal reaction time.
Remember: The more variables you control, the more reliable your results will be!
We thought you’d never ask...
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
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