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Weigh the Earth

Twist a fibre with lead balls. Then weigh the whole Earth from one tiny pull.

Physics · Class 11 · Newton's law of gravitation · 6 simulations. For JEE, NEET and your boards.

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What you'll learn

  1. One pull: Newton's law: F = G m₁ m₂ / r²
  2. Twist the fibre: The fibre twists until κθ balances the pulls
  3. Weigh the Earth: Weigh the Earth: M = gR²/G
  4. A row of lead balls: Add the pulls as arrows
  5. Scoop a hole: A hole: the full ball minus the missing ball
  6. Sun or Moon?: Compare two pulls with M/r²