poundal

Thân thiện

A physics student calculates the force in poundals acting on a small cart.

Definition

1. Noun:
   • A unit of force: A poundal is a unit of force in the foot-pound-second (FPS) system. It is defined as the force required to accelerate a mass of one pound at a rate of one foot per second per second.

Usage

• The poundal is used in physics and engineering contexts, primarily within the FPS system of units, to measure force.
• It is a smaller unit of force compared to the more commonly used pound-force (lbf).

Examples

• Noun:
  • The textbook defined the poundal as the force needed to give a one-pound mass an acceleration of one foot per second squared.
  • In the FPS system, force can be expressed in poundals.

Advanced Usage

• Technical Context: The poundal is a coherent derived unit in the absolute FPS system, where the pound is used as a unit of mass. This contrasts with the gravitational FPS system, where the pound is often used as a unit of force (pound-force).
• Dimensional Analysis: One poundal is dimensionally equivalent to .

Variants and Related Words

• Pound-force (lbf): A related but distinct unit of force in the gravitational FPS system, defined as the force exerted by gravity on a one-pound mass. One pound-force is approximately equal to 32.174 poundals.

Synonyms

• Unit of force: This is a general synonym, as the poundal is a specific type of force unit.

Related Phrases

• Foot-pound-second system (FPS): The system of measurement in which the poundal is defined.
• Newton (N): The SI unit of force. One poundal is equal to approximately 0.138255 newtons.

Học thuật

Noun

1. a unit of force equal to the force that imparts an acceleration of 1 foot/sec/sec to a mass of 1 pound; equal to 0.1382 newtons

Từ đồng nghĩa

• pdl