いきおい
vigor, momentum
Power at the bottom and everything above it stacking up. Ee い, kee き, oi おい. Once it is moving nobody needs to push, and nobody could stop it either: いきおい.
勢いで means on a roll, carried by it. 力 ちから is strength standing still.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.