Physics

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Across
  1. 2. What kind of force holds planets in orbit and pulls an apple to the ground. It is the mutual force of attraction between particles of matter (pg 240)
  2. 5. What is this ratio used to find (ouput force/ input force)? (Pg 258)
  3. 7. The fact that the acceleration of objects in free fall on Earth’s surface is always the same confirms that gravitational mass and what other kind of mass is equal. (Pg 247)
  4. 10. What is the measure of how well a machine works? (Pg 260)
  5. 14. Astronauts feel weightless due to a lack of which force that is usually acting on them? (Pg 253)
  6. 16. Who developed this equation for the Law of universal gravitation? Fg = G(m1m2/r^2) (Pg 241)
  7. 17. What kind of speed depends on distance? (Pg 234)
  8. 20. The ability of a force to rotate an object around some axis is measured by a quantity called what? (Pg 255)
  9. 22. The perpendicular distance from the axis of rotation to a line drawn along the direction of the force is called what? (Pg 255)
  10. 23. Where is the net force directed toward when an object’s circular path is called centripetal force? (Pg 237)
  11. 26. What is the period called for the time it takes a planet to finish one full revolution? (Pg 249)
  12. 27. When tangential speed is constant the circular motion is described as what? (Pg 234)
  13. 28. Whose three laws describe the motion of the planets? (Pg 248)
  14. 29. The what is the distance between the centers of the two bodies? (Pg 250)
  15. 30. How is the square of a planet’s orbital period (T^2) related to the cube of the average distance (r^3) between the planet and the sun, or T^2 sign r^3 (Pg 249)
Down
  1. 1. Each planet travels in what kind of orbit around the sun, and the sun is at one of the focal points? (Pg 249)
  2. 3. Gravitational field strength and free-fall acceleration are what? (Pg 246)
  3. 4. Centripetal acceleration is due to a change in what? (Pg 234)
  4. 6. In Ptolemy’s theory planets travel in small circles called what while simultaneously traveling in larger circular orbits? (Pg 248)
  5. 8. What kind of motion is a Ferris wheel in? (Pg 234)
  6. 9. On the surface of any planet, the value of g, as well as your what, will depend on the planet’s mass and radius? (Pg 246)
  7. 11. G is the what of universal gravitation? (Pg 241)
  8. 12. What can alter the force and distance moved? (Pg 260)
  9. 13. Scientists later developed a theory of fields to explain how gravity and other what operate? (Pg 245)
  10. 15. Which of Newton’s laws of motion can be applied to find the magnitude of centripetal force? (Pg 237)
  11. 18. What is the line about which rotation occurs called? (Pg 234)
  12. 19. What kind of acceleration is directed toward the center of a circular path? (Pg 235)
  13. 21. Who conducted the experiment in 1798 that determined the value of the constant G. (Pg 245)
  14. 24. Tangential acceleration depends on what? (Pg 236)
  15. 25. Orbiting objects are in what? (Pg 240)