Answer
CENTRIPETAL FORCE
向心力
WINDOW QUESTION · ANSWERSTEAM SQUAD
The question
WHAT IS THE INWARD FORCE THAT KEEPS THE WATER MOVING IN A CIRCLE?
讓水沿著圓形路徑留在瓶中的向內作用，叫什麼？
Why it works
IT CONTINUALLY TURNS THE WATER TOWARDS THE CENTRE OF ITS CIRCULAR PATH
它持續把水的運動方向轉向圓心，讓水跟著瓶子做圓周運動
See it in action · THE SPINNING WATER CHALLENGE
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