Across
- 2. any object that revolves about a single axis undergoes _______ motion. (p.234)
- 4. the line about which the rotation occurs is called the ____ of rotation. (p.234)
- 8. G The _______ is called the constant of universal gravitation. (p.241)
- 10. The word ‘centripetal’ means “________ seeking.” (p.235)
- 12. The ocean tides result from the __________ between the gravitational force at Earth’s surface and at Earth’s center. (p.244)
- 14. Gravitational force depends on the ______ and the distance. (p.241)
- 15. __________’s theory attempted to reconcile observation with theory and to keep Earth at the center of the universe. (p.248)
- 18. _______ acceleration is due to a change in direction. (p.234)
- 20. Tangential acceleration is due to ______ in speed. (p.236)
- 21. Gravitational force acts _______ all masses. (p.241)
- 22. The acceleration of a Ferris wheel car moving in a circular path at a constant speed is due to the change in _______. (p.235)
- 23. _______ changes with location. (p.246)
- 24. when the tangential speed is constant, the motion is described as ______ circular motion. (p.234)
- 27. The astronomer Tycho _____ made many precise observations of the planets and stars. (p.248)
- 29. On the side of Earth that is nearest to the moon, the moon’s gravitational force is _______ than it is at Earth’s center. (p.244)
Down
- 1. _________ speed can be used to describe the speed of an object in circular motion. (p.234)
- 3. _____________ force is the mutual force of attraction between particles of matter. (p.240)
- 5. the tangential speed depends on the _____ from the object to the center of the circular path. (p.234)
- 6. The net _____ that is directed toward the center of an object’s circular path is called centripetal _____. (p.237)
- 7. The _________ of a centripetal acceleration is given by the equation tangential speed squared divided by the radius of circular path. (p.235)
- 9. __________ depends on a change in velocity, and change time, according to the equation. (p.234)
- 11. ________’s three laws describe the motion of the planets. (p.248)
- 13. The ability of a force to rotate an object around some axis is measured by a quantity called ______. (p.255)
- 16. Because centripetal forces act at _____ angles to an object’s circular motion, the force changes the direction of the object’s velocity. (p.238)
- 17. arm The perpendicular distance from the axis of rotation to a line drawn along the direction of the force.
- 19. High and low _____ are partly due fl the gravitational force exerted on Earth by its moon. (p.244)
- 20. The force that causes a passenger to move outward when making a sharp turn in a car. (p.238)
- 25. _______ is often misinterpreted as a force. (p.239)
- 26. The gravitational force between a cannonball and Earth is a centripetal force that keeps the cannonball in _____, if the cannon was projected at the right time. (p.240)
- 28. Orbiting objects are in ____ fall, according to Sir. Isaac Newton. (p.240)