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of 59 available terms

### 59 Multiple choice questions

1. equation for Newton's second law of motion
2. An object that remains at rest within earth's gravitational field is said to be in ____ _______.
3. law that states that the orbit of every planet has the shape of an ellipse and that the two foci of each planetary orbit are relatively close together
4. law that states that every action has an opposite and equal reaction
5. term for any push or pull on an object
6. term for the science of mechanics that seeks to explain motion by describing its causes
7. A body in motion tends to move in a ____ ___ at a constant ____.
8. An object in ____ _____ is not easily tipped over.
9. law that says that for any planet, the square of the period of revolution is proportional to the cube of the average distance from the sun
10. An object in ____ _____ can be overturned without changing the height of its center of gravity.
11. law that says that as a planet gets farther away from the sun, the distance traveled by the planet must shorten and the velocity must decrease
12. the fundamental force that exists only between electrically charged bodies, binds the electrons of an atom to the nucleus, and causes an atom to resistance the penetration of its space by another atom
13. the weakest of the fundamental forces that exists between any two bodies of matter; attracts, but does not repel; and holds the moons, planets, and stars in their orbits
14. term for the state in which an object's center of gravity is unsupported, and the point where the force of gravity is effectively applied is free to move in the direction of the applied force
15. term for the farthest position from the sun in a planet's orbit
16. Johannes Kepler's three laws of planetary motion
17. Scientist have sought to remove the mystery from gravitation by imagining that each object sets up a _____ ____ in which other objects are impelled to move by a force in the object's surrounding space.
18. term for the force of a surface against the weight of an object
19. term for the force exerted on an object's mass by the earth's gravity
20. the simplest way of determining the center of gravity for irregular objects
21. The _____ ("sun-centered") model of the solar system has become the foundation of modern astronomy.
22. True or False: Kinetic friction is dependent on velocity.
23. term for an object's resistance to sliding
24. A body at rest tends to stay at rest, unless acted upon by an outside ___.
25. the four fundamental forces of nature (from strongest to weakest)
26. term for rest mass
27. As the distance from the earth's center of mass increases, ____ diminishes.
28. term for the science of mechanics that seeks merely to describe motion by describing its causes
29. ____ is caused by unbalanced forces acting on the same object.
30. term for an object's resistance to start sliding
31. term for a body's tendency to maintain its velocity, or a resistance to any change in velocity
32. the law that states that a body in motion tends to move in a straight line at a constant speed, and a body at rest tends to stay at rest, unless acted upon by an outside force
33. the strongest of the four fundamental forces that holds an atomic nucleus together
34. two fundamental forces that might be basically different expressions of the same force
35. An object in ____ _____ is upset at the slightest disturbance.
36. term for the point in an object that describes the combined effect of all the individual particles of mass
37. term that means "earth-centered"
38. term for any part of a machine that supports a moving part
39. term for the one spot that represents the combined effect of gravity's influence on all the particles in an object
40. sixteenth century Polish astronomer who proposed that sun was the center of the solar system
41. True or False: Rough surfaces produce more friction than smooth surfaces.
42. term for the closest position to the sun in a planet's orbit
43. term for the force that acts against every object in motion in the opposite direction to slow it down, or the resistance arising when an object moves through a medium or across a surface
44. Forces always occur in action-reaction ____.
45. True or False: Kinetic friction is dependent on the area of contact between the surfaces.
46. law that states that the same kind of force exists between any two masses, regardless of size; specifically, that they are mutually attracted by a force governed by the proportionality
47. two types of friction
48. four methods of reducing friction on a surface
49. term for the attractive force that exists between any two masses
50. the fundamental force responsible for certain particle interactions in the radioactive decay of atomic nuclei
51. term for the time required for any planet to complete one orbit about the sun
52. term for the acceleration of an object in free fall (the gravitational force per unit mass)
53. Action and reaction are always opposite, equal, and along the same ___.
54. Kinetic friction on a horizontal surface is proportional to the ____ of the moving object.
55. Greek astronomer who created a geocentric model of the solar system in the second century A.D.
56. equation for weight
57. True or False: 'Gravitation' and 'gravity' do not mean the same thing.
58. book by Isaac Newton that presented three laws of motion that still serve as the conceptual foundation of physics
59. The normal force always acts _____ to a surface.