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Builder's Lab / Week 09 / Friday
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Week 09 · Balloon Car

Friday

Test car version 2
// A car pushed by balloon air
⏱ about 20 min

Friday: Test Car Version 2

Raven slides each wheel out a little.

Now the caps spin freely without touching the cardboard.

A grown-up fills the balloon to the same size for Rocket.

Let go! The car glides and glides.

"Forty eight inches! That is four feet!" Nova cheers.

VersionWhat changedHow far (inches)Past 3 feet?
Rocket version 1Wheels rub10No
Rocket version 2Wheels spin freely48Yes

Compare honestly

Three feet is 36 inches.

Version 2 went 48 inches, so it met the goal.

The balloon size stayed the same.

Only the wheels changed.

READ THE RESULTS
  • Read the question.
  • Tap your answer.
Which version met the goal?
What one thing changed?
IdeaTrue or false?
Less rubbing helped the car go farther.?
Version 2 used a bigger balloon.?
WHY THIS EXERCISELowering friction was the fix that matched the problem.
Try it
Check that your wheels spin freely.
Use the same balloon size.
Measure how far it rolls.
Safety first
A grown-up blows up the balloon.
Throw away broken balloon pieces right away.
VersionWhat changedHow far (inches)
Your version 1
Your version 2

Inches to feet

12 inches make 1 foot.

24 inches make 2 feet.

36 inches make 3 feet.

48 inches make 4 feet.

COMPARE THE CARS
  • Read the question.
  • Tap your answer.
How far did version 2 go?
How many inches is 3 feet?
Did version 1 meet the goal?
OUR BALLOON CAR WEEK
  • Tap a card.
  • Then tap its spot.
1Monday
2Tuesday
3Wednesday
4Thursday
5Friday
ResultTrue or false?
Version 2 rolled 4 feet.?
The crew used a bigger balloon.?
Free wheels helped the car go farther.?
WHY THIS EXERCISEHonest results show the fix worked.

Your car is rolling far!

Tomorrow is Build Day.

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