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The question is backwards, so we need to untangle it a bit. The force of gravity causes weight, not the other way around. So the force of gravity is not stronger because an object is heavier - instead, an object is heavier because the force of gravity is stronger.

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The force of gravity is directly proportional to the mass of an object (see the related question - What is the definition of mass). The greater mass an object has, the greater the force of gravity upon that object. The force due to gravity is:

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Fg = m x ag

where:

  • Fg is the force due to gravity,
  • m is the mass of the object, and
  • ag is the acceleration due to gravity, which is -9.8 m/s2 at the surface of planet earth.
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