AST Unit 3 - Gravity and Motion

Edit Answers
12345678910111213141516171819
Across
  1. 4. This astronomer stated that the orbits of planets around the sun were elliptical, the planets do not orbit at a constant speed, and that an orbit is related to its distance from the sun.
  2. 6. Rate of change of velocity
  3. 8. Force of gravity acting on an object
  4. 12. Italian astronomer and mathematician who was the first to use a telescope to study the stars
  5. 15. Newton's ____ Law: For every action, there is an equal and opposite reaction
  6. 16. Newton's ____ Law: Force equals mass times acceleration
  7. 17. Alexandrian astronomer who proposed a geocentric model with circular orbits and epicycles that was undisputed until Copernicus
  8. 19. Law of ____ ____: Every object in the universe attracts every other object
Down
  1. 1. A model of the solar system in which Earth and the other planets revolve around the sun
  2. 2. Measure of how elongated an orbit is
  3. 3. Gravitational force experienced by an object on the surface of a planet
  4. 5. ____ Revolution: The realization, toward the end of the 16th century, that Earth is not at the center of the universe
  5. 7. Minimum velocity needed to escape the gravitational pull of a planet
  6. 9. A Danish astronomer who designed and built new instruments for observing the heavens and trained many other astronomers. His observations were later used by Kepler.
  7. 10. A model of the universe in which Earth is at the center of the revolving planets and stars.
  8. 11. Newton's ____ Law: An object at rest stays at rest, and an object in motion stays in motion with the same velocity
  9. 13. Tendency of an object to resist changes in motion
  10. 14. Devised a model of the universe with the Sun at the center, and not earth.
  11. 18. Amount of matter in an object