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As the aim of an experiment is to see what happens when one thing is changed and how it affects something else. If you change two variables, then you don't know which variable is responsible for the change e.g. You are measuring the time it takes for something to fall. If you change both the height and the shape of the object, the time is lengthened. You don't know if the lengethening of time is a result of the change in object shape or height.

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