physics chapter 7

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Across
  1. 5. An object in circular motion has a centripetal ____
  2. 7. no object that is within a certain distance of a ______ can move fast enough to escape the gravitational pull of the black hole.
  3. 10. When you raise a ball to a certain height above Earth, the ball gains _____
  4. 11. gravitational force = ____ × mass1xmass2/distance between masses ^2
  5. 15. a quantity that measures the ability of a force to rotate an object around some axis
  6. 18. ___ finds the value of G and Earth’s mass
  7. 20. the acceleration directed toward the center of a circular path
  8. 21. _ force and acceleration are directed toward the center of the circular path.
  9. 22. The two quantities are the ____ of the central object and the distance between the centers of the objects.
  10. 23. Both the period and speed of an object that is in a circular orbit around another object depend on ____ quantities
  11. 24. Tangential speed (vt) can be used to describe the ____ of an object in circular motion
  12. 28. _ is the gravitational force that would be exerted on a unit mass at any given point in space and is equal to free-fall acceleration.
  13. 29. Polish astronomer Nicolaus _____ (1473–1543) published On the Revolutions of the Heavenly Spheres
  14. 30. Every ___ in the universe is attracted to every other ___ by a force that is directly proportional to the product of the ____ masses
Down
  1. 1. Third Law: The square of a planet's ___ period (T^2) is proportional to the cube of the average distance (r^3) between the planet and the sun T^2<r^3
  2. 2. ___ is present all around you
  3. 3. the mutual force of attraction between particles of matter
  4. 4. the perpendicular distance from the axis of rotation to a line drawn along the direction of the force
  5. 6. An object in circular motion has a _____ acceleration
  6. 8. Simple machines provide a mechanical ___.
  7. 9. The particle that directly __ is also inversely proportional to the square of the distance between the particles.
  8. 12. An ____ that revolves about a single axis undergoes circular motion.
  9. 13. Kepler developed _ laws of planetary motion.
  10. 14. Second Law: An imaginary line drawn from the sun to any planet sweeps out equal areas in equal time _____.
  11. 16. symbol for ____ T
  12. 17. The torque on an object depends on the ____ of the applied force and on the lever arm.
  13. 19. symbol for ____ is F^^c
  14. 25. symbol for ____ is V^^t
  15. 26. In the second century CE, Claudius ______ developed an elaborate theory of planetary motion.
  16. 27. First Law: Each planet travels in an ______ orbit around the sun, and the sun is at one of the focal points.