# MenkyoQuest — Question ch4_q048

Chapter: Ch. 4 Pre-Drive Conduct
Section: 第５節 安全運転に必要な知識など
Type: Multiple choice
Difficulty: medium

## Question
Which statement correctly describes the magnitude of centrifugal force?

## Options
A. Centrifugal force increases as the radius of a curve becomes larger, and increases in proportion to speed
B. Centrifugal force increases as the radius of a curve becomes smaller, and increases in proportion to speed
C. Centrifugal force increases as the radius of a curve becomes smaller, and increases in proportion to the square of the speed
D. Centrifugal force increases as the radius of a curve becomes larger, and increases in proportion to the square of the speed

## Correct answer
C. Centrifugal force increases as the radius of a curve becomes smaller, and increases in proportion to the square of the speed

## Explanation
Section "2. Natural Forces Acting on Vehicles (2) Centrifugal Force" states: "The magnitude of centrifugal force increases as the radius of a curve becomes smaller, and increases in proportion to the square of the speed." The key points are the smaller radius and proportionality to the square of the speed.

## Driving school curriculum
Stage 2 – Topic 5: Human capability and driving

## Source passage (Rules of the Road)
２ 自動車に働く自然の力 (２) 遠心力 - 遠心力の大きさは、カーブの半径が小さいほど大きくなり、速度の２乗に比例して大きくなります。

## Tags
遠心力, カーブ, 速度, 半径

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Source basis: National Police Agency's official Rules of the Road manual (Public Domain under Article 13 §2 of Japan's Copyright Act).
Copyright on AI-drafted explanations belongs to the MenkyoQuest team.