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Kepler's Clock

Race planets round the Sun. Use Kepler's laws to set a lap time or a speed.

Physics · Class 11 · Kepler's laws · 6 simulations. For JEE, NEET and your boards.

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What you'll learn

  1. Four times as far: Kepler's third law: T² ∝ r³
  2. Swing past the Sun: Equal areas in equal times: v × r is the same at both ends
  3. Heights, not radii: Kepler's law uses the distance from the centre
  4. A comet's year: For an ellipse, use the semi-major axis a
  5. Line them up: Line-ups: the faster one gains one full lap
  6. Round a long rod: Change the force law, and the period law changes