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How to Calculate Attractive Force

Gravity is a force of attraction that we can calculate using Newton's law of gravitation. According to Wolfram, Newton's law of gravitation states the gravitational force exerted on an object from another object is equal to the gravitational constant of (6.67 * 10^-11 N m^2/Kg^2) * the mass of the object in question * the mass of the other object all divided by the distance between them squared, or F=GMm/r^2.

Scientific calculator

Instructions

- 1
  Find the mass of the first object. For an object that is of equal density throughout, the mass is density * volume.
- 2
  Find the mass of the second object. If you are looking for the mass of a planet or the sun, these can be found through U.S. Department of Energy's "Ask a Scientist." Tables of the masses of moons and stars can also be found.
- 3
  Multiply the masses; then multiply that product by the gravitational constant of (6.67 * 10^-11 N m^2/Kg^2).
- 4
  Divide the new product by the square of the distance between the two objects. This will give you the gravitational, or attractive, force between the objects.

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