friction

friction — noun

1. a natural force that slows or stops a moving object when it rubs against another

1.nounB1
Definition

a natural force that slows or stops a moving object when it rubs against another object, a surface, or a substance such as air or water

Example

The boy rubbed his hands together, and the friction made them feel warm.

Car tyres are designed to create friction on the road to keep the vehicle from sliding.

passive: are designed to create [enough] friction

Common collocations
  • reduce friction
  • low friction
  • high friction
  • friction between + surfaces
  • friction causes heat
  • create friction
Synonyms
  • resistance

    broader term; friction is one type of resistance, but resistance also includes air drag and electrical opposition

  • drag

    specifically refers to friction in fluids (air or water), not between solid surfaces

  • rubbing

    everyday word for the action, not a scientific term for the force

Antonyms
  • smoothness

    a quality of a surface, not a force; the opposite condition, not the opposite force

  • lubrication

    a substance or process that reduces friction, not strictly an antonym

Grammar Patterns

friction between + two surfaces/objects

friction of + substance + against + surface

friction + verb (causes / slows / stops)

Usage Note

Frequently found in science and engineering contexts where the amount of friction is described as high, low, or minimal. Always uncountable — do not use 'a friction' or 'frictions' for this sense.

Common Mistakes

There are frictions in the engine that waste energy.
There is friction in the engine that wastes energy.
The physical force is uncountable; never use the plural form for this sense.
Smooth surfaces have no friction.
Smooth surfaces have very low friction.
Even smooth surfaces create some friction; in real physics there is almost never zero friction.

2. feelings of anger, annoyance, or tension that arise when people or groups disagr

2.nounB1
Definition

feelings of anger, annoyance, or tension that arise when people or groups disagree about what to do or how to think about things

Example

Élise and her roommate had friction over whose turn it was to clean the kitchen.

collocation: friction between [people] over [topic]

Cultural differences can cause friction among team members working in international companies.

collocation: cause friction among [group]

Common collocations
  • cause friction
  • create friction
  • avoid friction
  • lead to friction
  • friction between + people/groups
  • friction over + issue
  • reduce friction
Synonyms
  • tension

    broader term; tension can exist without any open disagreement, while friction suggests actual clashing

  • conflict

    stronger and more direct; conflict involves active opposition, while friction is milder and more persistent

  • discord

    more formal and literary; suggests serious lack of agreement or harmony

  • disagreement

    refers to a single instance or event, whereas friction suggests a continuous state

Antonyms
  • harmony

    opposite of friction; a state of agreement and peace

  • agreement

    opposite of disagreement; a resolved or shared position

Grammar Patterns

friction between + people/groups

friction over + topic

cause/create/avoid friction

Usage Note

Always uncountable — do not use 'a friction'. This sense often names the cause with 'over' (the issue) or 'between' (the parties). Unlike 'conflict', friction implies an ongoing low-level strain rather than an open fight.

Common Mistakes

We had a friction about how to spend the money.
There was some friction between us over how to spend the money.
Friction is uncountable; use 'some' or 'a lot of', never 'a friction'.
The friction between the two brothers solved after they talked.
The friction between the two brothers went away after they talked.
Friction does not 'solve'; it 'goes away', 'disappears', or 'is resolved'.

Word family

  • frictional
    adjectiveC1
  • frictionless
    adjectiveC1
  • frictive
    adjectiveC2

Synonym discussion

Sense: noun/2

All four words describe negative states between people, but they differ in intensity and duration. Friction suggests ongoing low-level irritation that builds up over time — like surfaces rubbing together. Tension describes a feeling of nervousness or strain that may or may not lead to open disagreement; it can exist without any direct clash. Conflict is stronger and more direct, implying active opposition or confrontation rather than mere strain. Discord is more formal and literary, pointing to a serious lack of harmony, often in relationships or groups. Disagreement is the mildest — a single instance of differing opinions that can be resolved quickly. For example: 'There was constant friction between the two colleagues over shared equipment.' 'The tension in the room was obvious during the salary negotiations.' 'The disagreement was settled after a short discussion.'

tension ↗conflict ↗discorddisagreement ↗

Common collocations

Nouns

Adverbs

Phrases

  • lead to friction
  • reduce friction
  • source of friction

Prepositions

Etymology

LatinFrenchEnglish

From Latin frictio (a rubbing), derived from fricāre meaning 'to rub.' The word entered English through French in the 1500s. For centuries it referred only to the physical rubbing of objects. In the 1700s, writers began using it metaphorically for the 'rubbing' of personalities, giving us the modern sense of social tension.