centre of mass: meaning, definition, pronunciation and examples
C1Technical / Academic
Quick answer
What does “centre of mass” mean?
The point in an object or system of objects where its entire mass can be considered to be concentrated for the purposes of analyzing its motion.
Audio
Pronunciation
Definition
Meaning and Definition
The point in an object or system of objects where its entire mass can be considered to be concentrated for the purposes of analyzing its motion.
A conceptual focal point representing the average position of all mass in a system; figuratively, the most important or influential part of something.
Dialectal Variation
British vs American Usage
Differences
British English uses the spelling 'centre'. American English uses the spelling 'center'.
Connotations
Identical technical meaning. The figurative use is more common in American English discourse.
Frequency
High frequency in physics, engineering, and aerospace contexts in both varieties. Slightly higher frequency in American English media for figurative use.
Grammar
How to Use “centre of mass” in a Sentence
The centre of mass of [NOUN PHRASE] is [PREPOSITIONAL PHRASE / ADJECTIVE].[VERB] the centre of mass.Vocabulary
Collocations
Examples
Examples of “centre of mass” in a Sentence
verb
British English
- Engineers will centre the mass distribution.
- The system's design effectively centred the mass.
American English
- Designers aimed to center the mass low in the vehicle.
- The configuration centers the mass optimally.
adverb
British English
- The load is distributed centre-of-mass-wise.
- Not commonly used.
American English
- Not commonly used as an adverb.
adjective
British English
- The centre-of-mass calculation is crucial.
- We reviewed the centre-of-mass position.
American English
- A low center-of-mass design improves stability.
- The center-of-mass coordinates were recorded.
Usage
Meaning in Context
Business
Rarely used literally. Figuratively: 'The centre of mass for global tech innovation has moved to Asia.'
Academic
Core concept in physics, engineering, biomechanics, and astronomy.
Everyday
Almost never used in literal sense. Figurative use is possible but high-register: 'The park is the centre of mass for community activities.'
Technical
Primary, precise term in mechanics: 'The rocket's trajectory depends on the location of its centre of mass.'
Vocabulary
Synonyms of “centre of mass”
Watch out
Common Mistakes When Using “centre of mass”
- Confusing 'centre of mass' with 'centre of gravity' (they coincide in a uniform gravitational field, but are distinct concepts).
- Using plural verb with 'centre of mass' (e.g., 'The centre of mass are...' is incorrect).
- Misspelling 'centre'/'center' according to the wrong variety.
FAQ
Frequently Asked Questions
In a uniform gravitational field, like on Earth's surface, they are identical. Technically, centre of mass is a geometric property independent of gravity, while centre of gravity depends on the gravitational field's uniformity.
Yes. For objects with certain shapes, like a ring or a boomerang, the centre of mass lies in the empty space inside or outside the object's material.
A lower centre of mass increases stability and reduces the risk of tipping over, which is critical for cars, lorries, and ships.
It varies with posture. Generally, for a standing person with arms at their sides, it is located roughly in the pelvis area, slightly below the navel.
The point in an object or system of objects where its entire mass can be considered to be concentrated for the purposes of analyzing its motion.
Centre of mass is usually technical / academic in register.
Centre of mass: in British English it is pronounced /ˌsen.tər əv ˈmæs/, and in American English it is pronounced /ˌsen.t̬ɚ əv ˈmæs/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[figurative] The centre of mass of the debate shifted after the new evidence was presented.”
Learning
Memory Aids
Mnemonic
Imagine balancing a broomstick on your finger. The single point where it balances perfectly is its centre of mass.
Conceptual Metaphor
IMPORTANCE IS MASS / FOCUS IS A PHYSICAL CENTRE.
Practice
Quiz
In which sentence is 'centre of mass' used figuratively?