center of mass: meaning, definition, pronunciation and examples
C1Technical / Scientific
Quick answer
What does “center of mass” mean?
The unique point in an object or system where the mass is considered to be concentrated for the purpose of analyzing translational motion.
Audio
Pronunciation
Definition
Meaning and Definition
The unique point in an object or system where the mass is considered to be concentrated for the purpose of analyzing translational motion.
A focal or balancing point in any system, physical or abstract, where the main weight or influence is perceived to be concentrated.
Dialectal Variation
British vs American Usage
Differences
No difference in meaning or usage. The spelling follows regional norms: 'centre of mass' (UK) vs. 'center of mass' (US).
Connotations
Purely technical and neutral in both dialects.
Frequency
Equally frequent in relevant technical contexts in both regions.
Grammar
How to Use “center of mass” in a Sentence
The center of mass [of something] [verb]...To find/calculate/determine the center of massVocabulary
Collocations
Examples
Examples of “center of mass” in a Sentence
adjective
British English
- centre-of-mass coordinate
- centre-of-mass frame
American English
- center-of-mass coordinate
- center-of-mass frame
Usage
Meaning in Context
Business
Rare; potentially metaphorical, e.g., 'The center of mass of the industry has shifted towards Asia.'
Academic
Core concept in physics, engineering, and astronomy.
Everyday
Very rare outside of specific educational or hobbyist contexts (e.g., discussing car handling).
Technical
Primary domain of use. Essential for calculations in dynamics, stability, and orbital mechanics.
Watch out
Common Mistakes When Using “center of mass”
- Using 'centre of gravity' interchangeably in all contexts (they are different if the gravitational field is not uniform).
- Misspelling as 'center of the mass'.
- Treating it as a general synonym for 'middle' in non-technical writing.
FAQ
Frequently Asked Questions
No. The centre of mass is a geometric property depending only on mass distribution. The centre of gravity depends on the gravitational field. They coincide only in a uniform gravitational field, like near Earth's surface.
Yes. For objects with certain shapes (like a boomerang, a donut, or a horseshoe), the centre of mass lies in the empty space outside the physical material.
It simplifies the analysis of motion. The entire mass of a system can be thought to be concentrated at this point when studying its translational movement, separating it from rotational effects.
For a flat object, you can suspend it from two different points and draw vertical plumb lines from each point of suspension. The intersection of these lines is the centre of mass.
The unique point in an object or system where the mass is considered to be concentrated for the purpose of analyzing translational motion.
Center of mass is usually technical / scientific in register.
Center of mass: in British English it is pronounced /ˈsɛntə əv ˈmæs/, and in American English it is pronounced /ˈsɛn(t)ər əv ˈmæs/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Imagine balancing a ruler on your finger. The single point where it balances perfectly is its Center Of Mass.
Conceptual Metaphor
THE FOCAL POINT IS A CENTER OF MASS (e.g., 'The city was the center of mass for artistic innovation').
Practice
Quiz
In which scenario is the term 'center of mass' most precisely applicable?