# MenkyoQuest — Question ch4_q046

Chapter: Ch. 4 Pre-Drive Conduct
Section: 第５節 安全運転に必要な知識など
Type: True/False
Difficulty: hard

## Question
When speed doubles, braking distance, centrifugal force, and impact force all double.

## Correct answer
False

## Explanation
The text clearly states: "When speed doubles, braking distance, the force that causes a vehicle to skid or roll over on curves, and the impact force related to the severity of traffic accidents do not double—they quadruple." These forces are proportional to the square of the speed, so quadrupling is correct.

## 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 (４) 速度の影響 - 速度が２倍になれば、制動距離、カーブで車の横滑りや転倒をさせようとする力、交通事故の大きさに関係する衝撃力は、２倍になるのではなく、４倍になります。

## Tags
速度, 制動距離, 遠心力, 衝撃力, 引っかけ

## Related links
- HTML version: https://www.menkyoquest.com/en/q/ch4_q046
- Try the full chapter quiz: https://www.menkyoquest.com/en/quiz/ch4
- Home: https://www.menkyoquest.com/en/

---
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.