velocity
/vi'lɔsiti/
Definition
- Noun:
- Speed of motion in a specific direction: The rate at which an object changes its position. It is a vector quantity, meaning it has both magnitude (speed) and direction.
- Rate of occurrence or action: (In a more general, often figurative sense) The speed at which something happens or changes.
Usage and Examples
- Noun (Physical Science):
- The car's velocity was 60 miles per hour due north. (This specifies both how fast and in which direction it was moving.)
- To calculate the escape velocity, you need to know the planet's mass and radius.
- Noun (General/FIgurative):
- The velocity of technological change is astonishing. (This describes the rapid rate of change.)
- Money changes hands with great velocity in a bustling market.
Advanced Usage
- Terminal velocity: The constant maximum speed reached by a falling object when the force of gravity is balanced by the drag force of the medium (e.g., air).
- A skydiver in a spread-eagle position reaches a terminal velocity of about 120 mph.
- Angular velocity: The rate of change of angular position of a rotating object.
- The angular velocity of the wheel is measured in radians per second.
- Relative velocity: The velocity of an object as observed from a particular frame of reference.
- The relative velocity of two trains approaching each other is the sum of their individual speeds.
Variants and Related Words
- Velocimeter (n): An instrument for measuring velocity.
- Velocious (adj): (Rare) Characterized by speed; swift.
Synonyms
- Speed: (The key difference is that "speed" is a scalar quantity—it only has magnitude, not direction.)
- Rate: A measure of how quickly something happens.
- Swiftness: Rapidness of movement.
- Pace: The speed at which something progresses.
Related Phrases and Compounds
- Muzzle velocity: The speed of a projectile as it leaves the muzzle of a firearm.
- Initial velocity: The velocity of an object at the start of a time period or motion.
- Velocity vector: A vector that represents an object's velocity, showing both magnitude and direction.
Notes on Usage
- In precise scientific and engineering contexts, "velocity" is distinguished from "speed" by its inclusion of directional information. In everyday language, they are often used interchangeably, though "velocity" can sound more technical.
- It is commonly used in physics, mechanics, astronomy, and engineering.
Noun
-
distance travelled per unit time
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