Physics Puzzle

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Across
  1. 4. The orbital shape described in Kepler’s first law.
  2. 7. Conserved rotational quantity equal to I·ω.
  3. 9. Force that keeps an object moving in a circle, always directed toward the center.
  4. 10. Astronomer who created the three laws of planetary motion.
Down
  1. 1. Time it takes an object to complete one full orbit.
  2. 2. The constant G in Newton’s law of universal gravitation.
  3. 3. Point in a planet’s orbit where it is closest to the Sun.
  4. 5. Minimum speed needed to break free from a planet’s gravity.
  5. 6. Difference in gravitational pull that causes tides.
  6. 8. Apparent outward force felt in a rotating frame; a pseudo-force.