center of mass

Thân thiện

The toy car balances perfectly at its center of mass.

Definition

Noun: - Point representing the mean position of the matter in a body: The center 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 term center of mass is used primarily in physics and engineering to describe and calculate the motion of objects. It is a fundamental concept in mechanics. - It is often used with prepositions like of (e.g., the center of mass of the Earth). - It is treated as a singular noun (e.g., The center of mass is located here).

Examples

• Noun:
  • The center of mass of a uniform sphere is at its geometric center.
  • To balance the seesaw, the center of mass of the system must be directly above the fulcrum.
  • Engineers must calculate the rocket's center of mass to ensure stable flight.

Advanced Usage

• "Locate the center of mass": A common phrase meaning to find or calculate the position of this point.
  • The first step in the analysis was to locate the center of mass of the irregularly shaped object.
• Conceptual usage in broader contexts:
  • The city's downtown acts as the cultural and economic center of mass for the entire region. (This is a metaphorical extension of the concept, implying a focal point of activity or influence.)

Variants and Related Words

• Centroid (n): A closely related geometric center, often equivalent to the center of mass for an object of uniform density.
• Center of gravity (n): For most practical purposes on Earth, this is synonymous with , though technically it is the point where the gravitational force can be considered to act.

Synonyms

• Barycenter (n): Specifically used in astronomy for the center of mass of two or more bodies orbiting each other.
• Balance point (n): A more general, non-technical term for a point where an object balances.

Related Phrases

• Motion of the center of mass: A key principle stating that the center of mass of a system moves as if all external forces were applied directly to it.
  • Despite the complex movements of the diver's limbs, the motion of her center of mass followed a perfect parabolic arc.

Học thuật

Noun

1. point representing the mean position of the matter in a body

Từ đồng nghĩa

• centre of mass