← Back to course
Builder's Lab / Week 07 / Friday
5/6
Week 07 Β· Marble Run

Friday

Test, then test again
// A marble run that takes 5 seconds or more
⏱ about 20 min

Friday: Test, Then Test Again

The crew tapes the chutes at a gentler slant.

"Four seconds," Nova says. "Closer!"

Rocket groans, then grins. "Still short. One more change!"

Raven points to the empty space. "Add a fourth chute there."

Plop! "Six seconds!" Nova cheers.

VersionWhat changedTime (seconds)Reached the cup?
Rocket version 1Steep chutes2Yes
Rocket version 2Gentler slope4Yes
Rocket version 3Added a fourth chute6Yes

Compare honestly

Version 2 was slower, but it still missed the goal.

So the crew changed one more thing.

Version 3 took 6 seconds and reached the cup.

Sometimes it takes more than one improvement!

READ THE RESULTS
  • Read the question.
  • Tap your answer.
Which version met the 5 second goal?
How many things changed from version 2 to version 3?
PUT THE TIMES IN ORDER, FASTEST FIRST
  • Tap a card.
  • Then tap its spot.
1Fastest
2Middle
3Slowest
Try it
Change one thing on your run.
Time it again.
Keep going until you reach 5 seconds.
Safety first
Keep marbles away from babies and toddlers.
Pick up marbles so nobody slips.
VersionWhat changedTime (seconds)
Your version 1
Your version 2
Your version 3

More than one fix

Version 2 was slower, but not slow enough.

So the crew made one more change.

Each version changed just one thing.

That way they knew what helped.

FOLLOW THE VERSIONS
  • Read the question.
  • Tap your answer.
What changed in version 2?
What changed in version 3?
How much slower was version 3 than version 1?
ResultTrue or false?
Version 2 met the 5 second goal.?
Every version reached the cup.?
The crew changed one thing each time.?
WHY THIS EXERCISEOne change at a time shows what really worked.
OUR MARBLE WEEK
  • Tap a card.
  • Then tap its spot.
1Monday
2Tuesday
3Wednesday
4Thursday
5Friday

You kept improving until it worked!

Tomorrow is Build Day.

← Thursday