11
Lesson 11 of 84 · Light
ExperimentTesting Our Ideas
What You'll Learn
When scientists test ideas, they change one thing at a time and keep everything else the same.
Key Words
- tool
- material
Materials Needed
- paper clips
- rubber bands
- string
- cups
- aluminum foil
- ruler
Safety First
- Do not mix unknown chemicals together.
- Tie back long hair before starting the experiment.
- Protect your work surface with newspaper or plastic.
Steps
Step 1 — Read
Read and learn: When scientists test ideas, they change one thing at a time and keep everything else the same.
Step 2 — Do
Sort, group, or arrange the items as shown.
Step 3 — Observe
Watch carefully. What happens?
Step 4 — Record
Draw and write about what you learned.
Check Your Understanding
Question 1
1 of 3What does a scientist do?