A prototype is an early test model — cheap and quick to build — that shows whether an idea works before the real thing is made. Engineers test prototypes fairly: they change only one thing at a time, keep everything else the same, measure rather than guess, repeat each test and write every result down. Then they compare results, work out the mean (average) and improve the design.
Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.
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🏁 Lesson 5 test
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
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🖨️ Engineering Worksheet: Prototypes and Fair Tests
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