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A1 noun #2,723 most common 8 min read

慣性

kansei
Practice it Examples Notes & Tips 慣性 in 30 Seconds
Explanation 慣性 in your Level:
慣性 (Kansei) is a word from science. It means 'inertia.' Imagine you are on a bus. The bus starts to move, and you feel your body pull back. Or, the bus stops suddenly, and you fall forward. That feeling is 'Kansei.' It is the rule that things want to keep doing what they are doing. If a ball is rolling, it wants to keep rolling. If a chair is sitting still, it wants to stay still. In simple Japanese, we use this word to talk about how things move. Even though this word is usually for older students, you can see it in simple science books. Just remember: 'Kansei' = 'Staying the same.' If you are moving, you stay moving. If you are stopped, you stay stopped. It is like a 'habit' for objects. Kanji: 慣 (habit) + 性 (nature). So, it is the 'nature of habit.'
At the A2 level, you can start using 慣性 (Kansei) to describe simple physical actions. For example, when you are riding a bicycle and you stop pedaling, the bike keeps moving for a while. That is because of 慣性. In Japanese, you can say 「慣性で動いています」(It is moving by inertia). This word is very useful when talking about cars, trains, or sports. You might also hear it in a simple way to describe habits. If you do the same thing every day without thinking, like brushing your teeth, you are doing it 'by inertia.' However, usually, we use the word '習慣' (shūkan) for habits. Use 'Kansei' when you want to sound a bit more like a scientist or when talking about the physical feeling of movement. It's a great word to know for basic safety conversations, like why you should wear a seatbelt.
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For B1 learners, 慣性 (Kansei) becomes a bridge to more abstract concepts. You should know the term '慣性の法則' (Kansei no hōsoku), which is the Law of Inertia. This is a common phrase in Japanese culture. You can also use it metaphorically. For example, if a project at work is continuing even though it’s not very successful, you can say it’s moving 'by inertia' (慣性で進んでいる). This implies that nobody is making a choice to continue; it's just happening because it started. This level of usage shows that you understand not just the physics, but the 'flow' of Japanese logic. You will see this word in news reports about accidents or in articles about technology. It is a 'stiff' word (koto-ba), so it makes your Japanese sound more professional and precise.
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At the B2 level, you should be able to distinguish between 慣性 (Kansei) and 惰性 (Dasei). While Kansei is neutral and scientific, 惰性 often has a negative nuance, like being in a 'rut.' However, Kansei can be used in business to describe 'organizational inertia' (組織の慣性). This is the tendency for a large company to resist change. You might hear a manager say, 'We need to break our inertia to innovate.' Here, Kansei is used to describe a powerful, almost invisible force that keeps the status quo. You should also be comfortable with related terms like '慣性力' (inertial force). In discussions about social issues or economics, Kansei is used to explain why certain trends continue even after the original cause is gone. It’s a key word for analyzing systems and behaviors.
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C1 learners should appreciate the philosophical and technical depth of 慣性. In literature or high-level essays, Kansei might be used to describe the 'inertia of history' or the 'inertia of the human soul.' It suggests a deterministic view of life—that we are all moving in directions set by past forces. You will encounter this word in academic papers, particularly in physics, engineering, and sociology. Understanding the 'Moment of Inertia' (慣性モーメント) in a technical sense might be necessary for those in STEM fields. Furthermore, you can use the word to critique societal structures, such as the 'inertia of bureaucracy' (官僚制の慣性). At this level, you are expected to use the word with precision, recognizing its power to describe the resistance inherent in all systems, whether they are made of matter or people.
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At the C2 level, 慣性 is a tool for complex systemic analysis. You can discuss how 'cognitive inertia' (認知の慣性) affects decision-making processes in high-stakes environments. You might analyze how the 'inertia of language' preserves certain cultural values even as society modernizes. The word becomes a way to describe the 'mass' of abstract concepts. In a debate, you might argue that a policy failed because it didn't account for the 'social inertia' of the local population. You should also be aware of its use in advanced theoretical physics (like General Relativity) where the equivalence of inertial and gravitational mass is a central theme. For a C2 speaker, 慣性 is not just a word; it is a lens through which to view the persistence of all phenomena in the universe, from the rotation of galaxies to the stubbornness of a political ideology.
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Practice it Examples Notes & Tips

慣性 in 30 Seconds

  • Inertia: The physical property where objects resist changes to their current state of motion or rest.
  • Commonly used metaphorically in Japanese to describe habits or systems that continue without conscious effort.
  • Key phrase: 'Kansei no hōsoku' (The Law of Inertia), taught in every Japanese school.
  • Connotation: Neutral in science, but often slightly negative in social contexts (implying a lack of purpose).

The term 慣性 (Kansei) is a profound Japanese concept that bridges the gap between hard physical science and the subtle nuances of human psychology. At its core, it refers to inertia—the fundamental principle in physics where an object remains in its current state of motion or rest unless an external force intervenes. However, in the Japanese language, the utility of 慣性 extends far beyond the laboratory. It is frequently used to describe the 'momentum' of habits, the 'stagnation' of corporate culture, or the 'automaticity' of daily routines. When you look at the kanji, 慣 (Kan) represents being accustomed to something or a habit, while 性 (Sei) denotes nature, property, or character. Together, they literally translate to 'the nature of habituation' or 'the property of remaining as one is.'

Scientific Definition
Newton's First Law of Motion; the tendency of objects to resist changes in their state of motion.
Psychological Nuance
The tendency for people to continue a behavior or thought pattern simply because it is already established.
Societal Context
The resistance within an organization to change its established protocols or 'the way things have always been done.'

"宇宙空間では、物体は慣性によって永遠に動き続ける。" (In outer space, objects continue to move forever due to inertia.)

Understanding 慣性 requires recognizing that it is a passive force. It is not an active choice to move or stay still; rather, it is the lack of a choice to change. In Japanese literature and daily conversation, you might hear someone say they are living 'by inertia' (慣性で生きている), implying a lack of passion or direction, merely following the path of least resistance. This metaphorical usage is what makes the word essential for advanced learners. It captures a specific type of existential 'drifting' that is common in modern life.

"長年の習慣の慣性を断ち切るのは難しい。" (It is difficult to break the inertia of long-standing habits.)

Furthermore, the word is often paired with 'Law' (法則 - hōsoku) to form 慣性の法則 (The Law of Inertia). This is taught early in Japanese middle schools, making the term recognizable to almost every native speaker. In a business setting, 'organizational inertia' (組織の慣性) is a common topic in management seminars, referring to the difficulty of pivoting a large company toward new technologies or markets. The word carries a weight of inevitability—a sense that things will keep going as they are unless a significant 'force' (圧力 or 動機) is applied.

"ブレーキを踏んでも、車の慣性ですぐには止まれない。" (Even if you hit the brakes, you can't stop immediately because of the car's inertia.)

Physical Example
A passenger jerking forward when a bus stops suddenly.
Mental Example
Continuing to check your phone every five minutes even when you have no notifications.

"彼は慣性に従って、毎日同じ道を歩いている。" (He walks the same path every day, following inertia.)

In summary, 慣性 is a versatile term that describes the 'staying power' of a state. Whether it is a physical object in a vacuum or a salaryman in a 30-year career, 慣性 explains why things don't change easily. To master this word is to understand a fundamental law of both the universe and the human heart.

Using 慣性 (Kansei) correctly involves distinguishing between its literal physical application and its figurative social application. In physics, it is almost always a noun that functions as the subject or the cause of an action. In daily life, it often appears in the phrase 「慣性で〜する」 (to do something by inertia/habit). This implies that the action is being performed without conscious thought or new energy, much like a rolling ball that hasn't hit a wall yet.

Grammar Pattern 1
[Noun] + の + 慣性 (The inertia of [Noun]). Example: 組織の慣性 (Organizational inertia).
Grammar Pattern 2
慣性 + で + [Verb] (Verb by inertia). Example: 慣性で動く (Move by inertia).
Grammar Pattern 3
慣性 + を + [Verb] (Verb the inertia). Example: 慣性を利用する (Utilize inertia).

"このプロジェクトは、もはや慣性で進んでいるだけだ。" (This project is now just moving forward by inertia.)

When you want to describe someone who is stuck in their ways, you might say they are 'trapped by inertia' (慣性に囚われている). This is a sophisticated way to describe resistance to change. In technical writing, you will see 慣性力 (Inertial force) and 慣性モーメント (Moment of inertia). These are specific engineering terms. For general learners, focusing on the metaphorical 'habitual' usage will provide the most value in conversation.

Another important usage is in the context of safety. Driving instructors in Japan frequently use the term to explain why following distance is necessary. 'Because of inertia, the car doesn't stop the moment you hit the brake' (慣性があるから、ブレーキをかけてもすぐには止まらない). This practical application makes it a vital word for anyone living or driving in Japan. It's also used in sports, like skiing or skating, where maintaining or breaking inertia is key to performance.

"思考の慣性を打ち破り、新しいアイデアを出そう。" (Let's break the inertia of our thinking and come up with new ideas.)

In professional settings, you might hear about 'systemic inertia.' If a company continues to use outdated software because 'it's what we've always used,' that is 慣性. To use the word here, you could say: 「古いシステムの慣性が、DX（デジタルトランスフォーメーション）を阻んでいる」(The inertia of the old system is hindering DX).

You will encounter 慣性 in four primary domains: education, automotive/safety, business/psychology, and science fiction. In the educational domain, it is a staple of the junior high school science curriculum. Every Japanese student learns about 'Newton's First Law' as '慣性の法則'. Consequently, using this word in a conversation about physics or movement will make you sound very precise and well-educated.

In the Classroom
Teachers explaining why you fall forward when a train stops.
In the Garage
Mechanics or driving instructors discussing braking distances and vehicle weight.
In the Boardroom
Consultants discussing why a company is failing to innovate.

"電車の急停車で、慣性によって乗客が前に倒れた。" (Due to the train's sudden stop, passengers fell forward because of inertia.)

In automotive contexts, the word is ubiquitous. Car reviews might mention the 'feeling of inertia' when cornering. Safety PSAs often use the term to remind drivers that physics doesn't care about their hurry. If you are watching a Japanese documentary on space or engineering (like those on NHK), 慣性 will be a recurring keyword. It's also a favorite in Science Fiction anime (like Gundam or Evangelion), where pilots discuss 'inertial dampers' or 'maneuvering using inertia' in zero-G environments.

In business and self-help, 慣性 is used to describe the 'autopilot' mode of life. Podcasts about productivity often talk about 'breaking the inertia of laziness' (怠惰の慣性を打破する). It’s a powerful word because it sounds more 'scientific' and 'inevitable' than just saying 'habit' (習慣). It implies a force of nature that requires a specific, calculated effort to overcome.

The most common mistake learners make with 慣性 is confusing it with 習慣 (Shūkan - Habit). While they are related, they are not interchangeable. 習慣 is a behavior you repeat (like drinking coffee), whereas 慣性 is the force or tendency that keeps that behavior going. You wouldn't say 'My inertia is to wake up at 6 AM,' but you could say 'I wake up at 6 AM out of inertia (惯性で), even on weekends.'

Mistake 1: Using it for positive momentum
Incorrect: "慣性に乗って成功した" (Succeeded by riding inertia). Correct: "勢いに乗って成功した" (Succeeded by riding the momentum/energy).
Mistake 2: Confusing with 'Gravity' (重力)
While both are physical forces, inertia is about maintaining state, gravity is about attraction. Don't mix them up in scientific contexts.

"× 彼は良い慣性を持っている。 (He has good inertia.)"

"○ 彼は良い習慣を持っている。 (He has good habits.)"

Another nuance is the 'direction' of the word. 慣性 usually has a neutral or slightly negative connotation in social contexts. It implies a lack of conscious control. If you say a relationship is continuing 'by inertia' (慣性で続いている), it suggests the couple is only together because it's easier than breaking up, not because they are in love. Using it to describe a 'strong, purposeful drive' is a common error; for that, use 原動力 (Gendōryoku - Driving force).

To truly master 慣性, you must understand how it sits among its synonyms and related terms. The most frequent comparison is with 惰性 (Dasei). While 慣性 is a scientific term that can be used metaphorically, 惰性 is almost always used metaphorically and usually carries a negative connotation of 'laziness' or 'going through the motions.'

惰性 (Dasei)
Force of habit, momentum of past actions. Often used for relationships or jobs that have lost their spark.
勢い (Ikioi)
Momentum, vigor, energy. This is much more active and positive than 慣性.
習慣 (Shūkan)
Habit or custom. The specific action that is repeated.
維持 (Iji)
Maintenance or preservation. The active effort to keep something as it is.

"慣性は物理法則だが、惰性は心の状態だ。" (Inertia is a law of physics, but 'dasei' is a state of mind.)

In a scientific context, you might also encounter 静止 (Seishi - Rest/Stillness), which is the opposite state that inertia maintains. If an object is at 'seishi,' inertia keeps it there. If it is in 'undō' (運動 - motion), inertia keeps it moving. Understanding this duality is key to the physics definition. In business, マンネリ (Manneri - Mannerism/Rut) is a related katakana word used when things become repetitive and boring, often as a result of 'social inertia.'

How Formal Is It?

Difficulty Rating

Grammar to Know

〜によって (Due to/By)

〜に従って (Following/In accordance with)

〜まま (Remaining in a state)

〜だけで (Just by)

〜を打ち破る (Breaking through...)

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Examples by Level

1

電車が止まると、慣性で体が動きます。

When the train stops, my body moves due to inertia.

慣性で (kansei de) = by/due to inertia.

2

ボールは慣性で転がります。

The ball rolls by inertia.

Noun + で indicates the cause.

3

慣性は理科の言葉です。

Inertia is a science word.

Simple A is B structure.

4

止まっている物は、慣性で止まり続けます。

Objects that are stopped continue to stay stopped due to inertia.

止まり続ける (tomari-tsuzukeru) = continue to stay stopped.

5

車には慣性があります。

Cars have inertia.

〜があります = there is / has.

6

走っている人は、急に止まれません。慣性があるからです。

A running person cannot stop suddenly. It is because there is inertia.

〜からです = because it is...

7

スケートは慣性で進みます。

Skating moves forward by inertia.

進みます (susumimasu) = to move forward.

8

重い物は、慣性が大きいです。

Heavy things have large inertia.

大きい (ōkii) = large/big.

1

自転車をこぐのをやめても、慣性で少し進みます。

Even if you stop pedaling the bike, it moves forward a bit by inertia.

〜をやめても = even if you stop doing...

2

シートベルトは、慣性から体を守ります。

Seatbelts protect your body from inertia.

〜から守る = protect from...

3

宇宙では、慣性でずっと動くことができます。

In space, you can move forever by inertia.

動くことができる = can move.

4

慣性の法則を学校で習いました。

I learned the law of inertia at school.

習いました (naraimashita) = learned.

5

このおもちゃは慣性を利用して動きます。

This toy moves by utilizing inertia.

利用して (riyō shite) = utilizing/using.

6

急ブレーキをかけると、慣性が働きます。

When you hit the brakes hard, inertia works (acts).

働きます (hatarakimasu) = to work/act.

7

重いカバンは、慣性で振れやすいです。

A heavy bag swings easily due to inertia.

〜やすい (yasui) = easy to...

8

毎日同じ生活を慣性で続けています。

I continue the same life every day by inertia.

Metaphorical use of inertia as habit.

1

仕事が忙しくて、最近は慣性で動いているだけだ。

I'm so busy with work that lately I'm just moving by inertia.

〜ているだけだ = just doing...

2

慣性の法則によれば、物体は直進し続けます。

According to the law of inertia, an object continues to move in a straight line.

〜によれば = according to...

3

この古い習慣は、単なる慣性で残っている。

This old habit remains simply due to inertia.

単なる (tannaru) = mere/simple.

4

大型船は慣性が大きいため、すぐには旋回できない。

Because large ships have great inertia, they cannot turn immediately.

〜ため (tame) = because/due to.

5

心の慣性を変えるには、強い意志が必要です。

To change the inertia of the mind, a strong will is necessary.

〜には (ni wa) = in order to...

6

彼は慣性に流されるまま、日々を過ごしている。

He spends his days just being swept along by inertia.

〜まま (mama) = as it is / remaining in a state.

7

新しいプロジェクトを始めることで、慣性を打ち破りたい。

I want to break the inertia by starting a new project.

打ち破る (uchiyaburu) = to break/smash.

8

その車は慣性走行で燃費を稼いでいる。

That car improves fuel efficiency by coasting (inertial driving).

慣性走行 (kansei sōkō) = coasting/inertial driving.

1

組織の慣性が強すぎて、改革が進まない。

The organizational inertia is too strong, so reforms aren't progressing.

〜すぎて (sugite) = too much.

2

思考の慣性に囚われず、柔軟な発想をしよう。

Don't be trapped by the inertia of thought; let's have flexible ideas.

〜に囚われず (ni torawarezu) = without being trapped by.

3

景気の後退には一定の慣性があるため、すぐには回復しない。

Because economic downturns have a certain inertia, they don't recover immediately.

一定の (ittei no) = a certain/fixed.

4

慣性モーメントを計算して、機械を設計する。

Calculate the moment of inertia and design the machine.

Technical engineering term.

5

過去の成功体験という慣性が、新しい挑戦を邪魔している。

The inertia of past success experiences is hindering new challenges.

〜という (to iu) = called/of.

6

政治の世界では、既得権益の慣性が非常に強い。

In the world of politics, the inertia of vested interests is extremely strong.

既得権益 (kitoku ken'eki) = vested interests.

7

この映画のストーリーは、後半になると慣性で進んでいく感じがした。

I felt the story of this movie just moved by inertia in the second half.

〜感じがした = felt like...

8

慣性力は、加速する乗り物の中で感じることができる。

Inertial force can be felt inside an accelerating vehicle.

加速する (kasoku suru) = accelerating.

1

社会制度の慣性を打破するには、抜本的な改革が必要だ。

To break the inertia of social systems, drastic reforms are necessary.

抜本的な (bappon-tekina) = drastic/radical.

2

人間関係の慣性によって、冷え切った夫婦生活が続いている。

Due to the inertia of human relationships, a cold married life continues.

冷え切った (hiekitta) = chilled/cold.

3

市場の慣性を読み違えると、大きな損失を招くことになる。

Misreading the market's inertia will lead to significant losses.

〜を招く (o maneku) = to bring about/cause.

4

歴史の慣性は、個人の力ではどうにもできないほど巨大だ。

The inertia of history is so massive that an individual's power can do nothing about it.

〜ほど (hodo) = to the extent that...

5

学術界の慣性が、新しい理論の受容を遅らせている。

The inertia of the academic world is delaying the acceptance of new theories.

受容 (juyō) = acceptance.

6

都市開発における慣性の影響を考慮に入れるべきだ。

The influence of inertia in urban development should be taken into account.

考慮に入れる (kōryo ni ireru) = to take into consideration.

7

言語の慣性が、思考の枠組みを規定している側面がある。

There is an aspect where the inertia of language defines the framework of thought.

規定している (kitei shite iru) = defining/stipulating.

8

慣性系において、物理法則は不変である。

In an inertial frame of reference, physical laws are invariant.

慣性系 (kanseikei) = inertial frame.

1

官僚機構の肥大化に伴う慣性は、国家の活力を削ぐ要因となる。

The inertia accompanying the bloating of the bureaucracy becomes a factor that saps national vitality.

削ぐ (sogu) = to chip away/sap.

2

文明の慣性が、我々を破滅的な気候変動へと突き動かしている。

The inertia of civilization is driving us toward catastrophic climate change.

突き動かす (tsukiugokasu) = to drive/impel.

3

存在論的な慣性という観点から、アイデンティティの固定化を考察する。

Examine the fixation of identity from the perspective of ontological inertia.

存在論的 (sonzairon-teki) = ontological.

4

認識の慣性を脱却し、パラダイムシフトを成し遂げる。

Break free from cognitive inertia and achieve a paradigm shift.

脱却し (dakkyaku shi) = breaking free from.

5

マクロ経済における慣性インフレのメカニズムを解明する。

Elucidate the mechanism of inertial inflation in macroeconomics.

慣性インフレ (kansei infure) = inertial inflation.

6

法制度の慣性が、技術革新のスピードに追いついていない。

The inertia of the legal system is not keeping up with the speed of technological innovation.

追いついていない (oitsuite inai) = not catching up.

7

自己保存の慣性が、生物の進化を規定する基本原理の一つである。

The inertia of self-preservation is one of the basic principles that define biological evolution.

自己保存 (jiko hozon) = self-preservation.

8

権力の慣性は、革命の後ですら旧態依然とした構造を再生産する。

The inertia of power reproduces old-fashioned structures even after a revolution.

旧態依然 (kyūtai izen) = still the same as of old.

Synonyms

惰性 惰力 習性 停滞 固定化

Common Collocations

慣性が働く (Inertia acts)
慣性で動く (Move by inertia)
慣性を利用する (Utilize inertia)
慣性の法則 (Law of inertia)
組織の慣性 (Organizational inertia)
慣性モーメント (Moment of inertia)
慣性力 (Inertial force)
慣性系 (Inertial system)
慣性航法 (Inertial navigation)
慣性を打ち破る (Break inertia)

Common Phrases

慣性に従う (Follow inertia)
慣性に任せる (Leave it to inertia)
慣性がつく (Gain inertia/momentum)
慣性を失う (Lose inertia)
慣性による影響 (Influence due to inertia)
精神的な慣性 (Mental inertia)
社会的な慣性 (Social inertia)
慣性で生きる (Live by inertia)
慣性で続ける (Continue by inertia)
慣性の影響を受ける (Be affected by inertia)

Often Confused With

慣性 vs 惰性 (Dasei)

Dasei is purely metaphorical and usually negative; Kansei is scientific.

慣性 vs 感性 (Kansei)

Same pronunciation, but 感性 means 'sensitivity' or 'aesthetic sense'.

慣性 vs 完成 (Kansei)

Same pronunciation, but 完成 means 'completion'.

Idioms & Expressions

"慣性の法則に縛られる (To be bound by the law of inertia - stuck in one's ways)"
"慣性で転がる (To roll by inertia - things proceeding without help)"
"心の慣性を断ち切る (To cut off the inertia of the heart - to make a fresh start)"
"組織の慣性に飲み込まれる (To be swallowed by organizational inertia)"
"慣性のままに流れる (To flow as inertia dictates)"
"思考の慣性を揺さぶる (To shake the inertia of thought)"
"慣性が味方する (Inertia is on one's side - usually in sports)"
"慣性にブレーキをかける (To put the brakes on inertia)"
"慣性の渦 (Vortex of inertia)"
"慣性の重み (The weight of inertia)"

Easily Confused

慣性 vs

慣性 vs

慣性 vs

慣性 vs

慣性 vs

Sentence Patterns

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How to Use It

nuance

Neutral in physics, potentially negative in social contexts.

frequency

Common in educational and professional settings.

Common Mistakes
  • Using it as a verb (慣性する is wrong).
  • Confusing it with 'Kansei' (Sensitivity).
  • Using it for 'excitement' (that's 'Ikioi').
  • Misspelling the kanji 慣 (don't forget the heart radical on the left).
  • Thinking it only applies to moving objects (it applies to stationary ones too).

Tips

Driving Context

Always use Kansei when explaining why cars don't stop instantly.

Kanji Tip

Remember 慣 from 習慣 (habit). It makes the meaning clear.

Science Link

Link it to Newton's First Law in your mind.

Nuance

Use 'Kansei de' to sound like you're on autopilot.

Homophone Alert

Watch out for 'Kansei' (completion) in project meetings!

Essay Power

Use 'Soshiki no Kansei' to describe corporate stagnation.

School Life

Mentioning this word might trigger memories of science class for Japanese friends.

Mental Health

Used to describe the difficulty of changing one's mindset.

Space

Essential for discussing anything related to space travel.

Breaking the Rut

Use 'Kansei o uchiyaburu' for a strong 'breaking the cycle' vibe.

Memorize It

Word Origin

Sino-Japanese (Kango).

Cultural Context

Used in management books to describe 'The Innovator's Dilemma'.

Taught in 2nd year of Junior High science.

Used to describe a lack of motivation in long-term relationships.

Practice in Real Life

Real-World Contexts

Conversation Starters

"慣性の法則って、日常生活でも感じますよね？"

"組織の慣性を変えるにはどうすればいいと思いますか？"

"最近、慣性でやってしまっている習慣はありますか？"

"宇宙での慣性移動って、ロマンがありますよね。"

"ブレーキをかけた時の慣性、怖いですよね。"

Journal Prompts

自分の生活の中で、慣性で続けていることを書き出してみる。

もし慣性がなかったら、世界はどうなるか想像して書く。

組織の慣性を打ち破った経験について書く。

良い慣性（良い習慣の勢い）を作る方法を考える。

慣性で動いている自分を感じる瞬間はいつか。

Frequently Asked Questions

10 questions

Yes, metaphorically. It describes someone doing things by habit without thinking.

Kansei is the physical law; Dasei is the 'rut' or 'laziness' of habit.

Yes, everyone learns it in middle school science.

Rarely. 'Ikioi' is better for positive momentum.

慣性の法則 (Kansei no hōsoku).

Not exactly. It's the *force* of the habit, not the habit itself.

Yes, it's flat (0). If you change it, it might sound like 'completion'.

Yes, to describe body movement and momentum.

Yes, when discussing organizational behavior or market trends.

慣性航法 (Kansei kōhō).

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Related Content

More Science words

吸収

A1

The act of taking in or soaking up something, such as liquid, light, heat, or knowledge. It describes both a physical process, like a sponge soaking up water, and a metaphorical process, like a student learning new information quickly.

分析

B1

Analysis refers to the process of breaking down a complex topic, substance, or situation into smaller parts to gain a better understanding of its structure or nature. In Japanese, it is frequently used as a suru-verb in scientific, business, and logical contexts to describe objective investigation.

原子

A1

An atom is the basic building block of all matter and the smallest unit of a chemical element. It consists of a dense central nucleus surrounded by a cloud of negatively charged electrons.

引力

A1

The physical force of attraction that pulls objects toward one another, most famously observed as Earth's gravity. It is also used metaphorically to describe a powerful charm or magnetic influence that draws people toward something.

細菌

A1

Microscopic single-celled organisms that can be found everywhere, including inside the human body. While some cause diseases, many are beneficial for health and the environment.

繁殖

A1

The biological process by which animals, plants, or microorganisms produce offspring or increase in number. It is often used to describe the spreading or multiplication of species in a specific environment.

炭素

A1

Carbon is a chemical element with the symbol C and atomic number 6. It is a fundamental building block of life and is found in substances ranging from charcoal and graphite to diamonds.

触媒

A1

A substance that increases the rate of a chemical reaction without undergoing any permanent chemical change itself. Metaphorically, it refers to a person or event that causes an important change or action to happen more quickly.

塩素

A1

A chemical element (symbol Cl) that is a yellow-green gas with a strong smell. It is widely used for disinfecting swimming pools and tap water, as well as in cleaning products like bleach.

解明

A1

The act of clarifying, solving, or unraveling a mystery, a complex problem, or a scientific phenomenon through investigation. It emphasizes the process of making something that was previously hidden or unknown clear and understandable.

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