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Honmen (full license) test How a vehicle behaves

Centrifugal force increases as the radius of the bend gets smaller.

The real test question (Japanese)
遠心力は、カーブの半径が小さいほど大きくなる。

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Answer: ○ True

Centrifugal force rises with the square of speed and falls with the radius of the bend. At the same speed a tighter bend pulls you outwards harder, which is why braking must be finished before you enter it.

遠心力は速度の二乗に比例し、カーブの半径に反比例します。同じ速度でも急なカーブほど外へ引かれる力が強くなるため、カーブに入る前に減速を終えておく必要があります。

Source: 交通の教則

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