Chapter 7 Physics

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Across
  1. 2. Who was the mathematician and philosopher who developed the theory of planetary motion which attempted to reconcile observation with theory and to keep earth at the center of our universe?
  2. 6. the mutual force of attraction between particles of matter
  3. 8. The tides of oceans result from the __________ between the gravitational force at Earth’s surface and at Earth’s center.
  4. 10. the perpendicular distance from the axis of rotation to a line drawn along the direction of the force
  5. 13. On the side of the Earth that is nearest to the moon, the moon’s gravitational force is ________ than it is at Earth’s center.
  6. 14. The tangential speed depends on the ______ from the object to the center of the circular path.
  7. 15. a quantity that measures the ability of a force to rotate an object around some axis
  8. 17. The equation for centripetal acceleration can be combined with Newton’s _______ to create the whole equation.
  9. 19. A gravitational force is an interaction between a mass and the gravitational _____ created by other masses.
  10. 21. mass In Newton’s second law the variable m is also called ________ because m refers to the property of an object to resist acceleration.
  11. 23. When the tangential speed is constant, the motion is described as ____________________.
  12. 27. Gravitational force acts between all masses and gravitational force always _________ objects to one another.
  13. 28. What term can be used to describe the speed of an object in circular motion?
  14. 30. All machines are combinations or modifications of six fundamental types of machines called what?
Down
  1. 1. In Newton’s law of universal gravitation what does the variable G represent in the equation?
  2. 3. The net force that is directed toward the center of an object's circular path.
  3. 4. the acceleration directed toward the center of a circular path
  4. 5. When a passenger hits a door when turning in the car, the force that pushes the passenger outward is also known as what?
  5. 7. Since centripetal force acts at __________ to an object's circular motion, the force changes the direction of the object’s velocity.
  6. 9. The factors that cause ocean tides are the moon’s gravitational force, depth of the ocean basins, Earth’s _____ and rotation, and friction between the ocean water and the ocean floor.
  7. 11. When an object revolves around a single axis has circular motion, and the line that that the axis is rotating about is called what name?
  8. 12. On the opposite side of the Earth, the gravitational force is _______ than it is at the center.
  9. 16. Since velocity is a vector, acceleration can be produced by a change in the ______ of the velocity, a change in the direction of the velocity, or both.
  10. 18. In Newton's example of gravitational force the cannonball is a ________ and the horizontal distance that each cannonball covers increases as the cannonball’s initial speed increases.
  11. 20. Who was the philosopher who conducted an experiment that determined the value of the constant G?
  12. 22. Kelpler’s first law states that the planets’ _______ are ellipses rather than circles.
  13. 24. Kelpler’s second law states that an _______ line from the sun to any planet sweeps out equal areas in equal times.
  14. 25. Even though Gravitational force exists between any two masses of objects, these objects ______ don’t matter since they are regarded.
  15. 26. What direction is the centripetal acceleration always directed towards in a circle?
  16. 29. In the theory of planetary motion planets travel in small circles called______ while simultaneously traveling in larger circular orbits.