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Lesson 17 of 84 · Engineering and Design
ExperimentFair Tests: Changing One Thing
What You'll Learn
A fair test changes only one thing. If you change two things, you will not know which one made the difference.
Key Words
- problem
- solution
Materials Needed
- aluminum foil
- ruler
- markers
Safety First
- Adult supervision recommended.
Steps
Step 1 — Read
Read and learn: A fair test changes only one thing. If you change two things, you will not know which one made the difference.
Step 2 — Do
Sort, group, or arrange the items as shown.
Step 3 — Observe
Use your senses to describe what you notice.
Step 4 — Record
Write 1-2 sentences about what happened.
Check Your Understanding
Question 1
1 of 3What does 'predict' mean?