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