conservation of momentum: meaning, definition, pronunciation and examples
C1/C2Technical / Academic
Quick answer
What does “conservation of momentum” mean?
A fundamental law of physics stating that in a closed system with no external forces, the total momentum remains constant.
Audio
Pronunciation
Definition
Meaning and Definition
A fundamental law of physics stating that in a closed system with no external forces, the total momentum remains constant.
The principle that the total momentum before a collision or interaction equals the total momentum after, provided no external force acts. It can also be metaphorically extended to describe the persistence of impetus or progress in a non-physical system.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or grammatical differences. Pronunciation differences follow general UK/US patterns for the constituent words.
Connotations
Identical technical connotation. In metaphorical use, it may carry a slightly formal or scientific tone.
Frequency
Equally frequent in academic and technical physics contexts in both varieties.
Grammar
How to Use “conservation of momentum” in a Sentence
The [experiment/demonstration] illustrates [the] conservation of momentum.We can solve [this] by applying [the principle/law of] conservation of momentum.According to [the law of] conservation of momentum, [event/outcome].Vocabulary
Collocations
Examples
Examples of “conservation of momentum” in a Sentence
verb
British English
- The system's total momentum is conserved.
- We must conserve momentum in our calculations.
American English
- The system's total momentum is conserved.
- We need to conserve momentum in our analysis.
adverb
British English
- The particles interacted, and momentum was conserved perfectly.
- The system evolved momentum-conservingly.
American English
- The objects collided, and momentum was conserved perfectly.
- The process proceeded in a momentum-conserving fashion.
adjective
British English
- It's a fundamental conservation-of-momentum problem.
- The conservation of momentum principle is inviolable.
American English
- It's a basic conservation of momentum problem.
- The momentum conservation law is inviolable.
Usage
Meaning in Context
Business
Rare. Potentially metaphorical, e.g., 'The merger failed to maintain the conservation of momentum from both companies' marketing efforts.'
Academic
Core concept in physics and engineering lectures, textbooks, and problem sets.
Everyday
Virtually non-existent unless explaining a physical event (e.g., a car crash, a game of pool).
Technical
Essential in physics, engineering, astrophysics, and fluid dynamics calculations and simulations.
Vocabulary
Synonyms of “conservation of momentum”
Strong
Neutral
Weak
Vocabulary
Antonyms of “conservation of momentum”
Watch out
Common Mistakes When Using “conservation of momentum”
- Incorrect article: 'a conservation of momentum' (incorrect, as it's a unique principle).
- Omitting 'of': 'conservation momentum'.
- Treating it as an adjective: 'conservation-of-momentum principle' (hyphenated compound modifier is acceptable in some technical writing, but 'principle of conservation of momentum' is more common).
FAQ
Frequently Asked Questions
No, they are related but distinct. Newton's Third Law (action-reaction) is one way that momentum is transferred between objects, leading to the conservation of the total momentum.
It applies to the total system. If friction is an external force (e.g., from the ground), then the system you are analyzing is not closed, and total momentum may change. You must include all interacting objects to have a closed system.
Yes, absolutely. Momentum is a vector quantity. Conservation of momentum applies separately in the x-direction and the y-direction (and z-direction).
They are separate conservation laws. Momentum is conserved in all interactions if no net external force acts. Kinetic energy is only conserved in perfectly elastic collisions; it can be transformed into other forms (heat, sound) in inelastic collisions, while momentum is still conserved.
A fundamental law of physics stating that in a closed system with no external forces, the total momentum remains constant.
Conservation of momentum is usually technical / academic in register.
Conservation of momentum: in British English it is pronounced /ˌkɒnsəˈveɪʃən əv məʊˈmentəm/, and in American English it is pronounced /ˌkɑːnsərˈveɪʃən əv moʊˈmentəm/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[It's/That's] a classic case of conservation of momentum. (Metaphorical)”
Learning
Memory Aids
Mnemonic
Think of a game of pool: the cue ball's shove is shared among the other balls, but the total 'shove' (momentum) in the system stays the same.
Conceptual Metaphor
MOMENTUM IS A CONSERVED SUBSTANCE (it can be transferred but not created or destroyed within a system).
Practice
Quiz
Conservation of momentum is most directly applicable to which of the following scenarios?