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blade length
Blade length is the tested factor.
Class 5 · English Medium · Cambridge · General science
Fair tests, measurement and evidence
Explore fair tests, measurement and evidence with an example and your own answers.
Original Kidemy foundation practice · Read the example, write your answers, then check. This starter is shared across class versions; it is not a complete board-specific lesson or course.
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A fair test changes one tested factor. Record measurements with units, repeat trials where useful and use the evidence to limit your conclusion.
Worked example
To investigate paper-helicopter blade length, keep the paper type, drop height and release method alike. Measure the fall time over several trials.
- Read the example and explain which rule or evidence it uses.
- Try each task yourself, then compare the answer and its reason.
Your written practice
Show your working on paper and enter your answer here. If it does not match, compare the model and try again.
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seconds
Seconds measure time.
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A different height could change the fall time for another reason.
Check the explanation connects the controlled condition with a possible alternative cause.
Take it further
Apply the idea in a new situation and explain your method. Open writing needs a guardian or teacher to review it.
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5
Add to fifteen, then divide by three.
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grams
Grams measure mass; minutes measure time.
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Water changed as well, so a growth difference could involve light, water or both. Keep water alike in a revised comparison.
Identify the second changed factor and a practical correction.
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