Physics

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Across
  1. 3. Who developed this equation for the Law of universal gravitation? Fg = G(m1m2/r^2) (Pg 241)
  2. 5. What is the measure of how well a machine works? (Pg 260)
  3. 6. When tangential speed is constant the circular motion is described as what? (Pg 234)
  4. 9. Whose three laws describe the motion of the planets? (Pg 248)
  5. 12. Scientists later developed a theory of fields to explain how gravity and other what operate? (Pg 245)
  6. 16. What is this ratio used to find (ouput force/ input force)? (Pg 258)
  7. 18. Centripetal acceleration is due to a change in what? (Pg 234)
  8. 19. G is the what of universal gravitation? (Pg 241)
  9. 21. The perpendicular distance from the axis of rotation to a line drawn along the direction of the force is called what? (Pg 255)
  10. 22. Orbiting objects are in what? (Pg 240)
  11. 23. What is the period called for the time it takes a planet to finish one full revolution? (Pg 249)
  12. 24. The what is the distance between the centers of the two bodies? (Pg 250)
  13. 27. Each planet travels in what kind of orbit around the sun, and the sun is at one of the focal points? (Pg 249)
  14. 28. Who conducted the experiment in 1798 that determined the value of the constant G. (Pg 245)
  15. 29. 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. The ability of a force to rotate an object around some axis is measured by a quantity called what? (Pg 255)
  2. 2. What is the line about which rotation occurs called? (Pg 234)
  3. 3. Astronauts feel weightless due to a lack of which force that is usually acting on them? (Pg 253)
  4. 4. 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)
  5. 7. 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)
  6. 8. 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)
  7. 10. Which of Newton’s laws of motion can be applied to find the magnitude of centripetal force? (Pg 237)
  8. 11. What kind of speed depends on distance? (Pg 234)
  9. 13. Gravitational field strength and free-fall acceleration are what? (Pg 246)
  10. 14. What can alter the force and distance moved? (Pg 260)
  11. 15. In Ptolemy’s theory planets travel in small circles called what while simultaneously traveling in larger circular orbits? (Pg 248)
  12. 17. What kind of acceleration is directed toward the center of a circular path? (Pg 235)
  13. 20. What kind of motion can be separated from rotational motion? (Pg 254)
  14. 25. Tangential acceleration depends on what? (Pg 236)
  15. 26. Where is the net force directed toward when an object’s circular path is called centripetal force? (Pg 237)