kinematic pair
Very low (C2/Technical)Technical/Scientific
Definition
Meaning
A connection between two rigid bodies that permits relative motion.
In mechanical engineering, a kinematic pair is a joint between two links that constrains their relative movement, forming the basic building block of mechanisms like linkages and robotic joints. Common types include revolute (hinge) and prismatic (sliding) pairs.
Linguistics
Semantic Notes
The term is purely technical, used almost exclusively in mechanical engineering, robotics, and related physics. It refers to the abstract concept of a joint, not the physical parts themselves.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. Spelling of related terms follows regional norms (e.g., 'mechanism' vs. 'mechanisation/mechanization').
Connotations
None; term is purely denotative.
Frequency
Equally rare and specialised in both varieties, confined to engineering contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
[Link A] and [Link B] form a kinematic pair.The [joint type] is a common kinematic pair.A mechanism is built from several kinematic pairs.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None.”
Usage
Context Usage
Business
Not used.
Academic
Core term in mechanical engineering, robotics, and theoretical physics lectures and textbooks.
Everyday
Never used.
Technical
Fundamental term for describing the mobility and design of machines, mechanisms, and robotic arms.
Examples
By Part of Speech
verb
British English
- The two links are paired kinematically to allow rotation.
American English
- The mechanism kinematically pairs the lever and the slider.
adverb
British English
- The bodies are connected kinematically.
American English
- The system is kinematically constrained.
Examples
By CEFR Level
- N/A - This term is far beyond A2 level.
- N/A - This term is far beyond B1 level.
- A hinge is a simple example of a kinematic pair. (Possible in a technical B2 context.)
- The robot's wrist joint utilises a spherical kinematic pair to allow movement in three rotational degrees of freedom.
- Analysing a mechanism begins with identifying all the lower and higher kinematic pairs that connect its various links.
Learning
Memory Aids
Mnemonic
Think of a PAIR of scissors: the two blades are connected by a pivot, allowing specific motion—a classic KINEMATIC PAIR.
Conceptual Metaphor
A DANCING PARTNERSHIP: Two bodies move together in a pre-defined, constrained way, like partners in a formal dance who can only move in certain holds.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Не переводите дословно как "кинематическая пара". Хотя это прямой технический перевод, сам термин на английском звучит крайне специфично и не используется вне инженерии.
- Не путать с "kinematic chain" (кинематическая цепь) — ряд соединённых пар.
Common Mistakes
- Using 'kinematic pair' to describe any two moving parts (it requires a specific, constrained relative motion).
- Pronouncing 'kinematic' with stress on the first syllable (/ˈkɪn.../). Correct stress is on the third syllable (...'mat').
- Confusing 'pair' with 'pear' (the fruit) in spelling.
Practice
Quiz
What is the primary function of a kinematic pair?
FAQ
Frequently Asked Questions
No, it is a highly specialised technical term used almost exclusively in mechanical engineering, robotics, and applied physics.
A bearing is a physical device that *implements* a type of kinematic pair (often a revolute pair). The 'pair' is the abstract functional concept of the joint; the bearing is the hardware.
It would be very unusual and likely misunderstood. In non-technical contexts, use simple terms like 'joint', 'hinge', or 'connection'.
No. A kinematic pair is a single joint between two links. A kinematic chain is a series of links connected by such pairs to form a mechanism.