Lesson 21 of 30 · Simple Machines
Lesson⭐ 30 XP🛠️ Engineer ShopThrow and Fly!
%22%20%2F%3E%0A%20%20%0A%20%20%20%20%20%20%20%20%3Ccircle%20cx%3D%22108%22%20cy%3D%22100%22%20r%3D%226%22%20fill%3D%22%23cffafe%22%20opacity%3D%220.9%22%20%2F%3E%0A%20%20%20%20%20%20%20%20%3Ccircle%20cx%3D%22253%22%20cy%3D%22184%22%20r%3D%224%22%20fill%3D%22%23cffafe%22%20opacity%3D%220.7%22%20%2F%3E%0A%20%20%20%20%20%20%20%20%3Ccircle%20cx%3D%22547%22%20cy%3D%22100%22%20r%3D%225%22%20fill%3D%22%23cffafe%22%20opacity%3D%220.85%22%20%2F%3E%0A%20%20%20%20%20%20%20%20%3Ccircle%20cx%3D%22693%22%20cy%3D%22199%22%20r%3D%227%22%20fill%3D%22%23cffafe%22%20opacity%3D%220.9%22%20%2F%3E%0A%20%20%20%20%20%20%20%20%3Ccircle%20cx%3D%22376%22%20cy%3D%22347%22%20r%3D%22100%22%20fill%3D%22%23cffafe%22%20opacity%3D%220.2%22%20%2F%3E%0A%20%20%20%20%20%20%20%20%3Ccircle%20cx%3D%22443%22%20cy%3D%22342%22%20r%3D%2260%22%20fill%3D%22%23cffafe%22%20opacity%3D%220.25%22%20%2F%3E%0A%20%20%20%20%20%20%0A%20%20%3Ctext%20x%3D%22400%22%20y%3D%22270%22%20font-size%3D%22180%22%20text-anchor%3D%22middle%22%20dominant-baseline%3D%22middle%22%20font-family%3D%22-apple-system%2C%20Segoe%20UI%2C%20Roboto%2C%20sans-serif%22%3E%F0%9F%AA%A8%3C%2Ftext%3E%0A%3C%2Fsvg%3E)
Simple Machines.
🎯 Your mission
Master the concept. Use it tomorrow.
⚡ The twist
Every solution creates a new problem. That's good — that's the next project.
Mind = Blown
🌉 The Eiffel Tower can grow 6 inches taller in summer because metal expands when hot.
Make a hypothesis first
Predict: which design will hold the most weight?
What You'll Learn
You can make a paper airplane fly by throwing it. You give it a push!
Key Words
Tap a word to see its definition.
Steps
Say the vocabulary words out loud. Can you repeat them?
Push a toy car gently, then push it hard. Which push made it go farther?
Did anything change? Point to what is different.
Point to the things you used in the activity.
Check Your Understanding
Question 1
1 of 3What makes a ball roll?
Where you see this in real life
Every bridge, building, and gadget you've ever used started with this.
Stretch Challenge
Try this in real life this week.
Find something that's broken at home and try to figure out *why* it broke.
For the dinner table
“What's something around the house you'd redesign — and how?”
Next Smart Experiment
We'll pick an experiment that matches exactly how you're thinking right now.
Share this experiment
Send it to a parent who's looking for a 10-minute kitchen science win.
Ready?
Throw and Fly!
Master the concept. Use it tomorrow.
Full screen — no distractions
Checkout complete lesson on Simple Machines for Pre-School
Get the full Simple Machines track as a printable PDF — all lessons, worksheets, and answer keys.