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Plan an Investigation: Hypothesis and Method

In this worksheet, students will practise planning a scientific investigation and forming a hypothesis. The subject matter is Biology, but the skills apply to all other scientific disciplines.

'Plan an Investigation: Hypothesis and Method' worksheet

Key stage:  KS 3

Year:  Year 9 Science worksheets

Curriculum topic:   Working Scientifically

Curriculum subtopic:   Experimental Skills and Investigations

Popular topics:   Biology worksheets

Difficulty level:  

Worksheet Overview

Drugs affect the rate of our reactions depending on their properties. For example, depressants, like alcohol, slow us down. Therefore, drinking and driving is prohibited as well as driving after consuming more than the recommended amount of alcohol.


Other drugs, like caffeine, are stimulants, they make us alert. They are said to decrease our reaction time, which means when we have them, we react faster.


cola can


Athletes are tested prior to competitions. They are disqualified and not allowed to compete if they are found to have taken stimulants because this gives the athlete an advantage over other competitors.


In this activity, you will practise designing an experiment to find out if stimulants decrease reaction times. The experiment must involve the time it takes to catch a ruler; this is how you will measure the reaction time.



An image showing a ruler


Being able to write a hypothesis and method, including the different types of variables, are key skills that you will practise in this activity.

Now let's work through a series of questions together, your answers will help you plan most of your experiment.

Over to you!

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