Little detectives · 38/50 · Ages 8–10
Change one thing
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Owl compares two pretend paper spinners. To investigate the effect of wing length, Owl keeps paper, drop height, and the release method the same. A careful test tries to isolate a change.
What you will discover
- Change one chosen variable when testing its effect.
- Repeat observations; one try can be misleading.
English vocabulary
- test
- phép thử
- compare
- so sánh
Let’s play
To test wing length, what should change between the spinners?
- Only the chosen wing length
- Paper, height, and wings all together
- Everything randomly
See the explanation
Keeping other conditions similar makes the comparison easier to interpret.
Practise touch typing
Place your hands on F and J and type this sentence using ten fingers.
I change one thing and compare results.
Two little quiz questions
1. Why repeat a test?
- To see whether the result is consistent
- To guarantee your guess is right
- To avoid recording results
Answer and explanation
To see whether the result is consistent. Repeated observations can reveal variation.
2. If many things change together, can you easily tell which caused the result?
- No
- Yes, always
- Only if you like the result
Answer and explanation
No. Several changes make cause and effect harder to separate.