Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Universal Gravitational Law

Gravitational attraction between two objects vs. mass of the objects and the distance between them.

Sponsored Links

The gravitational attraction between two objects depends upon the mass of the objects and the distance between them. This relationship is often called the "Universal Law of Gravitation" and can be expressed as

F = kG m1 m2 / r2                           (1)


F = gravitational force (N)

kG = 6.668 10-11 (Nm2/kg2) = the Universal Gravitation Constant 

m = mass of object (kg)

r = distance between objects (m)

Example - The Gravitational Force (Weight) Acting on a Person on Earth's Surface

The gravitational force (or weight) acting on a person with mass 70 kg on the earth's surface (6.37 106 m from the earth's center) can be calculated as

F = (6.668 10-11 Nm2/kg2) (5.98 1024 kg) (70 kg) / (6.37 106 m)2

    = 688.1 (N)

  • 5.98 1024 (kg) = mass of earth
Sponsored Links

Related Topics

Related Documents

Sponsored Links

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

About the Engineering ToolBox!


We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.


This page can be cited as

  • Engineering ToolBox, (2005). Universal Gravitational Law. [online] Available at: [Accessed Day Mo. Year].

Modify access date.

. .


3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

3 30

Sponsored Links