What's Happening?
You both try your ideas. After 5 minutes in the rain, you check. Which cover kept the toy drier?
- Which cover do you think will work better? Why?
- How could you tell which one won?
Big Ideas
When we have a problem, we can think of more than one way to fix it. We call each way a design (that means a plan or idea for how to solve the problem).
But how do we know which design works best? We test each one! Then we collect the results — that means we write down or draw what happened.
Test Both Designs
Collect the Results
Let's Try It!
We will build two different walls at the bottom of the ramp. Then we will roll a ball down and see which wall stops it better!
What You Need:
A flat board (ramp), a small ball, blocks, and cardboard pieces.
After you try both designs, you have results! Results tell you what happened in each test. Now you can compare them side by side.
What We Found
When we tried our test, we found out something important! We can use a chart to show our results. A chart makes it easy to compare.
| What We Tested | Design A (Blocks) | Design B (Cardboard) |
|---|---|---|
| Did the wall stay up? | ✅ Yes! | ❌ It fell over |
| Did the ball stop? | ✅ Yes! | ❌ It rolled past |
| Was it easy to build? | It took a little time | Very fast |
Look at the chart. Design A worked better at stopping the ball. But Design B was faster to build. The results help us see what is good and what is not so good about each design.
This is why we collect results — so we can look at the facts and make a smart choice!
Spot the Pattern
Do you see a pattern? When we compare two things, we learn more than if we only look at one thing. This is called comparing. Scientists and engineers compare things all the time!
Let's see some examples:
| What We Compare | Why We Compare |
|---|---|
| 🥾 Two pairs of rain boots | To see which ones keep feet drier |
| 🌱 Two ways to plant seeds | To see which way helps plants grow taller |
| 🏗️ Two toy bridges | To see which one holds more weight |
See the pattern? When we test two things and collect results, we can figure out what works best. This pattern works for rain boots, plants, bridges, and anything else you can test!
Real World
People use testing and comparing every day to solve real problems!
Building Better Houses
Making Backpacks
Engineers are people who solve problems by designing and building things. They always test more than one idea. Then they look at the results to find the best solution.
You can be an engineer too! Next time you have a problem, think of two ideas. Test them both. Collect your results. Then pick the winner!
Key Vocabulary
- Design — A plan or idea for how to solve a problem.
- Test — To try something out to see what happens.
- Results — What happened after a test. The information we collected.
- Compare — To look at two or more things side by side to see how they are the same or different.
- Engineer — A person who solves problems by designing and building things.