비뉴턴 유체: 우블렉

전분과 물로 전단 농화 유체 만들기

Classroom Demonstrations Beginner (Middle School) 20 분 ~$3.00

목표

가해지는 힘에 따라 고체와 액체 모두로 거동하는 비뉴턴 유체를 만들고 탐구한다.

배경

Oobleck is a suspension of cornstarch in water that exhibits shear-thickening (dilatant) behavior. Under slow, gentle force, it flows like a liquid. Under sudden, strong force, the starch particles jam together and it behaves like a solid. This non-Newtonian behavior occurs because the starch particles are suspended at a critical concentration where they can rearrange under slow stress but lock together under rapid stress. The name comes from the Dr. Seuss book 'Bartholomew and the Oobleck.'

안전 경고

  • Cornstarch is slippery when wet — clean up spills immediately
  • Do not pour oobleck down the drain — it will clog pipes
  • Non-toxic but not for consumption

재료

  • Cornstarch (400 g)
    About 2 cups
  • Water (250 mL)
    About 1 cup
  • Food coloring (5 drops)
    Optional

장비

Large mixing bowl Spoon Plastic sheet or tray (to contain mess) Speaker with subwoofer (optional, for vibration demo)

실험 절차

1

Place the mixing bowl on the plastic sheet. Add the cornstarch to the bowl.

2 분
2

Slowly add water while mixing with your hands. The ideal ratio is about 1.5–2 parts cornstarch to 1 part water. Add water gradually until the mixture is the consistency of thick honey.

5 분
3

Test 1 (Slow force): Gently dip your hand in and slowly pull it out. The oobleck flows like a liquid.

3 분
4

Test 2 (Fast force): Punch the surface hard. Your fist bounces off as if hitting a solid.

3 분
5

Test 3 (Shaping): Squeeze a handful quickly into a ball. When you stop squeezing, it melts back into liquid.

3 분
6

Optional: Place the bowl on a speaker playing low-frequency bass. The oobleck forms standing wave patterns and finger-like protrusions.

4 분 Protect the speaker with plastic wrap

예상 결과

The oobleck flows under gentle handling but solidifies under impact. It can be rolled into a ball that melts in your palm. On a vibrating speaker, it forms dramatic standing wave patterns.

정리

Let oobleck dry and scrape off surfaces. Do NOT wash down drains. Dispose of dried oobleck in trash. Wipe surfaces with damp cloth.

세부 정보

카테고리
Classroom Demonstrations
난이도
Beginner (Middle School)
소요 시간
20 분
예상 비용
$3.00
단계
6
재료
3

더 많은 실험

드라이아이스 속 마그네슘 연소 25 min 진동하는 브릭스-라우처 반응 40 min 나트륨과 물의 반응 25 min 아이오딘 시계 반응 45 min 사라지는 비커(굴절률 매칭) 15 min 코끼리 치약 20 min 테르밋 반응 30 min 루미놀 화학발광 30 min 밀도 컬럼 무지개 30 min 순간 냉동: 과냉각수 120 min

Frequently Asked Questions

What is the objective of 비뉴턴 유체: 우블렉?
가해지는 힘에 따라 고체와 액체 모두로 거동하는 비뉴턴 유체를 만들고 탐구한다.
How difficult is 비뉴턴 유체: 우블렉?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for 비뉴턴 유체: 우블렉?
Key safety precautions include: Cornstarch is slippery when wet — clean up spills immediately; Do not pour oobleck down the drain — it will clog pipes; Non-toxic but not for consumption.
What materials are needed for 비뉴턴 유체: 우블렉?
The main materials required are: Cornstarch, Water, Food coloring.
What results should I expect from 비뉴턴 유체: 우블렉?
The oobleck flows under gentle handling but solidifies under impact. It can be rolled into a ball that melts in your palm. On a vibrating speaker, it forms dramatic standing wave patterns.