Definition

Noun: A unit of force equal to the force exerted by gravity on a body at rest. It is used to measure the force experienced by a body during acceleration or deceleration, relative to the standard acceleration due to gravity on Earth.

Usage

The term "g-force" quantifies the stress or load on an object or person during rapid changes in velocity. It is not a true force but a measure of acceleration expressed as a multiple of Earth's gravitational acceleration (approximately 9.8 m/s²). A g-force of 1g is equivalent to the normal force of Earth's gravity.

Examples

• Pilots and astronauts experience high g-forces during takeoff and sharp maneuvers.
• A roller coaster can subject riders to a g-force of up to 4g, making them feel four times heavier.
• The experiment measured the effects of sustained g-force on the human body.

Advanced Usage

• Positive g-force: Acceleration that pushes a body downwards, increasing the sensation of weight (e.g., during a pull-up maneuver in a jet).
• Negative g-force: Acceleration that pushes a body upwards, creating a sensation of lightness or lifting (e.g., the top of a roller coaster hill).
• Lateral g-force: Acceleration experienced sideways, common in high-speed turns (e.g., in car racing).

Variants and Related Words

• G-load: A synonym often used in engineering and aviation contexts.
• Acceleration: The general rate of change of velocity, of which g-force is a specific, comparative measurement.

Synonyms

• Gravitational force equivalent
• Acceleration load
• Inertial force

Related Phrases

• Pull g's: (Idiomatic) To experience or subject something to high g-forces.
  • The fighter pilot can pull up to 9 g's in his aircraft.
• G-force tolerance: The maximum g-force a person or structure can withstand.
  • Training helps to increase a pilot's g-force tolerance.

Noun

1. a unit of force equal to the force exerted by gravity; used to indicate the force to which a body is subjected when it is accelerated