Circular Motion and Gravitation

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Across
  1. 2. He attempted to reconcile observation with theory and to keep Earth at the center of the universe.
  2. 5. In circular motion, an acceleration due to a change in speed is called tangential ____________.
  3. 8. the perpendicular distance from the axis of rotation to a line drawn along the direction of the force
  4. 9. The lever arm depends on the _________.
  5. 10. Tangential speed depends on _________.
  6. 12. Centripetal force is necessary for ________ motion.
  7. 13. a quantity that measures the ability of a force to rotate an object around some axis
  8. 15. Gravitational force acts between ___________ masses.
  9. 16. Gravity is a _______ force.
  10. 17. Newton's law of gravitation accounts for ocean ______.
  11. 20. the acceleration directed toward the center of a circular path
  12. 21. Astronauts in orbit experience apparent _________.
Down
  1. 1. is an object that is so massive that nothing, not even light, can escape the pull of its gravity
  2. 3. He conducted an experiment that determined the value of the constant G.
  3. 4. His three laws describe the motion of the planets
  4. 6. a measure of how well a machine works
  5. 7. Orbiting objects are in _____________.
  6. 11. the mutual force of attraction between particles of matter
  7. 14. He proposed that Earth and other planets orbit the sun in perfect circles.
  8. 18. Gravitational mass equals ______ mass.
  9. 19. one of the six simple machines