GlossariesIGCSE GlossariesIGCSE Physics GlossaryGravitational Field Strength

Gravitational Field Strength - IGCSE Physics Definition

Reviewed by: Ann Howell

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In IGCSE Physics, gravitational field strength is defined as the force per unit mass acting on an object in a gravitational field.

On Earth, this is equal to 9.8 space straight N divided by kg. The gravitational field strength acting on an object is calculated using the equation

g space equals fraction numerator space W over denominator m end fraction

Where:

  • g = gravitational field strength, measured in newtons per kilogram (straight N divided by kg)

  • W = force of weight, measured in newtons (straight N)

  • m = mass of object, measured in kilograms (kg)

An object in free fall in a vacuum, in a uniform gravitational field, will accelerate at a rate of g

  • Where g = acceleration of free fall

In this context, g space equals space 9.8 space straight m divided by straight s squared

Gravitational field strength and acceleration of free fall are equivalent quantities.

Some exam boards use different values of g in their calculations. Use our exam board specific revision notes to find out which value your exam board uses.

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Ann Howell

Reviewer: Ann Howell

Expertise: Physics Content Creator

Ann obtained her Maths and Physics degree from the University of Bath before completing her PGCE in Science and Maths teaching. She spent ten years teaching Maths and Physics to wonderful students from all around the world whilst living in China, Ethiopia and Nepal. Now based in beautiful Devon she is thrilled to be creating awesome Physics resources to make Physics more accessible and understandable for all students, no matter their schooling or background.

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