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Bike Shop 3-5 / Week 12 / Friday
5/6
Week 12 · Design a Better Bike

Friday

Improve and look back
// Define, compare, test, improve
⏱ about 15 min

Friday: Improve and Look Back

Rocket adds a second layer to his basket. It holds every block now. "It works!"

Raven shows him her reflective strip design. "What do you notice? Could my idea help yours?"

Rocket grins. "A basket that carries books and shines in the dark!"

Nova hovers between them. "Sharing ideas can lead to better designs," she says.

Improve and share

After a test, engineers improve the failure point.

Then they test again to see if the change helped.

Sharing ideas with others is an important part of design.

Shared ideas can lead to improved designs.

THE DESIGN CYCLE
  • ?Build a model and test it.
  • ?Research and sketch many ideas.
  • ?Compare ideas with the criteria.
  • ?Improve it and test again.
  • ?Define the problem.
WHY THIS EXERCISEDefine, imagine, compare, build and test, then improve.
DESIGN QUESTIONS
  • Read the question.
  • Tap your answer.
Your basket bent at one corner. What should you improve first?
After you improve a model, what comes next?
How did Raven help Rocket?

Look back at Bike Shop

  1. A bike is a system of parts that work together.
  2. You explored forces, friction, tires, gears and the chain.
  3. You measured motion and found patterns.
  4. Brakes, a helmet that fits and being seen help keep riders safe.
  5. You found a leak, made a Quick Check and designed an add-on.
Course checkTrue or false?
A grown-up handles every bike tool.?
A helmet goes on for every ride.?
Kids grab the chain while it turns.?
The ABC Quick Check happens before a ride.?
WHY THIS EXERCISEGrown-ups handle tools, hands stay off moving parts, and helmets go on every ride.
Bubbles in water help find a tube's ____.
A test finds the design's failure ____.
Try it
Improve your model at its failure point.
Run your fair test again, three trials.
Did your change help? Write the new results.
Safety first
A grown-up does all cutting.
Use only soft, light things for weight.
Models stay off real bikes.
My modelTrial 1Trial 2Trial 3Better than version 1?
Version 2

Engineers at work! Tomorrow is the last Bike Shop Day: present your design to your family.

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