third law of motion
Definition
Noun: * Third Law of Motion: A fundamental law of physics, formulated by Sir Isaac Newton, which states that for every action (force) there is an equal and opposite reaction (force). This means that when one object exerts a force on a second object, the second object simultaneously exerts a force equal in magnitude and opposite in direction on the first object.
Usage
The term is used exclusively in the context of physics to describe and predict the interaction of forces between two bodies. * It is a proper noun and is often capitalized: Third Law of Motion. * It is frequently preceded by "Newton's" (e.g., Newton's Third Law of Motion).
Examples
- Basic Explanation:
- Scientific Context:
- Everyday Observation:
Advanced Usage
- "To obey/violate the third law of motion": Used to discuss whether a physical interaction is consistent with the law. Note: All real interactions obey it; a proposed interaction that violates it is considered impossible within classical mechanics.
- Any credible physics model must obey Newton's Third Law of Motion.
- In technical discussions, it is often referenced alongside its mathematical implications for conservation of momentum.
Variants and Related Words
- Newton's Third Law: A common shortened form.
- Action-Reaction Principle: A descriptive synonym focusing on the core concept.
- Law of Action and Reaction: Another synonymous phrase.
Synonyms
- Action-Reaction Law
- Newton's Third Law
Related Phrases
- Equal and opposite: The key phrase describing the nature of the forces in the law.
- The forces between two interacting objects are always equal and opposite.
- Action force and reaction force: The specific terms for the paired forces.
- It is crucial to identify the action force and reaction force correctly when applying the law.
Noun
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action and reaction are equal and opposite
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