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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.
✓ You passed this lesson’s test.
Test fairly, record honestly — “change one thing, keep the rest the same, measure and repeat”
Use it for: Science-fair projects, STEM challenges and any time two designs must be compared fairly.
Check: 280 × 3 = 840 = 300 + 260 + 280 ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 🧪 Prototype Tester badge when you pass — and a certificate when you finish all 8 lessons of Part 1 · What engineers do. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
Sign in with Google to ask Free — 20 questions a day.
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