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Object attracts each other due to their attraction force. However, there are different kinds of attraction force in the Earth.

1. Newton's Law of Universal GravitationThe law states that every point mass in the universe attracts every other point mass with a force. And the force of attraction is given by: F = Gm1m2 / r2, where
  • F is the force of attraction between the masses
  • G is the gravitational constant (6.674×10−11 N m2 kg−2)
  • m1 and m2 are masses
  • r is the distance between the centre of the masses
2. Coulomb's lawCoulomb's law describes the electrostatic force between electrically charged particles. Like charges repel, while unlike charges attract. The equation is similar to the above one: F = kq1q2 / r2, where
  • F is the electrostatic force
  • k is the Coulomb constant (8.988×109 N m2 C-2)
  • q1 and q2 are the charges
  • r is the distance between the charges
(Note: k can also be written as 1 / 4πε0, where ε0 is the permittivity of space, 8.85… × 10−12 F m-1) 3. Magnetic ForceMagnetic force exists because of magnetic field, which is interrelated with electric field. For two magnets, the north pole attracts south pole. The force of attraction depends on the strength both magnets, the distance between them, and the direction that they are placed.
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