Answer
CENTRIPETAL FORCE
向心力
WINDOW QUESTION · ANSWERBUILD CLUB
The question
WHAT FORCE CONTINUALLY ACCELERATES THE WATER INWARD SO IT FOLLOWS THE CUP’S CIRCULAR PATH?
讓水持續向圓心加速、跟著杯子繞圈的力叫什麼？
Why it works
WHEN THE CUP MOVES FAST ENOUGH, IT CONTINUALLY TURNS THE WATER ALONG THE CIRCULAR PATH
杯子移動得夠快時，它持續改變水的方向，讓水跟著圓形路徑移動
See it in action · THE SPINNING CUP CHALLENGE
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