centre of mass
Học thuậtThân thiện
Definition
- Noun:
- Point representing the mean position of the matter in a body: The centre of mass is a specific point in an object or system where the entire mass can be considered to be concentrated for the purpose of analyzing translational motion. It is the average location of all the mass in the system.
Usage
- The centre of mass is a fundamental concept in physics and engineering used to simplify calculations involving forces and motion.
- It is used when describing balance, stability, and the motion of objects under gravity or other forces.
Examples
- Noun:
- A perfectly symmetrical object's centre of mass is at its geometric centre.
- To balance the ruler on your finger, you must find its centre of mass.
- The rocket's trajectory depends on the motion of its centre of mass.
Advanced Usage
- "Locate the centre of mass": To find or calculate the position of this point.
- Engineers must locate the centre of mass of the aircraft for safe design.
- "Shift in the centre of mass": A change in the position of this point, often due to movement or redistribution of weight.
- When passengers stand on a bus, it causes a shift in the vehicle's centre of mass.
Variants and Related Words
- Center of mass (noun): The American English spelling variant. It has the same meaning and usage.
- Centroid (noun): In geometry, the centre of mass of a geometric shape of uniform density. While related, "centroid" is a more specific geometric term.
- Center of gravity (noun): A closely related point where the total weight of the body is considered to act. For objects in uniform gravitational fields, the centre of mass and centre of gravity coincide.
Synonyms
- Balance point: A simpler, more general term for the point where an object balances.
- Center of inertia: A less common synonym used in mechanics.
Related Phrases
- Motion of the centre of mass: A phrase describing how this specific point moves through space.
- The motion of the centre of mass of a system is not affected by internal forces.
Noun
- point representing the mean position of the matter in a body