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### 55 Matching questions

1. law of areas
2. period
3. geocentric
4. neutral equilibrium
5. center of gravity (CG)
6. normal force
7. law of periods
8. heliocentric
9. gravitation
10. gravitational force
11. law of orbits, law of areas, and law of periods
12. law of orbits
13. kinematics
14. False
15. stable equilibrium
16. Newton's first law of motion
17. Fw = mg
18. dynamics
19. F = ma
20. True
21. static friction and kinetic friction
22. friction
23. perihelion
24. unstable equilibrium
25. Ptolemy
26. Principia Mathematica
27. universal law of gravitation
28. minimizing roughness; choosing suitable materials; lubricating; and rollers and bearings
29. perpendicular
30. gravitational field
31. gravitational field strength
32. electromagnetic force
33. strong force, electromagnetic force, weak force, and gravitational force
34. Motion
35. instability
36. line
37. straight line, speed
38. static friction
39. center of mass
40. static equilibrium
41. weak force
42. multiple suspensions
43. Newton's third law of motion
44. gravity
45. electromagnetic force and weak force
46. pairs
47. Nicolaus Copernicus
48. kinetic friction
49. aphelion
50. bearing
51. inertial mass
52. inertia
53. weight
54. force
55. strong force
1. a Johannes Kepler's three laws of planetary motion
2. b As the distance from the earth's center of mass increases, ____ diminishes.
3. c 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
4. d term for rest mass
5. e term for the force of a surface against the weight of an object
6. f equation for Newton's second law of motion
7. g term for an object's resistance to sliding
8. h four methods of reducing friction on a surface
9. i True or False: Kinetic friction is dependent on velocity.
10. j 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
11. k the fundamental force responsible for certain particle interactions in the radioactive decay of atomic nuclei
12. l An object in ____ _____ is upset at the slightest disturbance.
13. m term for the farthest position from the sun in a planet's orbit
14. n The _____ ("sun-centered") model of the solar system has become the foundation of modern astronomy.
15. o An object that remains at rest within earth's gravitational field is said to be in ____ _______.
16. p 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
17. q term for the acceleration of an object in free fall (the gravitational force per unit mass)
18. r term for the attractive force that exists between any two masses
19. s the four fundamental forces of nature (from strongest to weakest)
20. t the simplest way of determining the center of gravity for irregular objects
21. u term for the science of mechanics that seeks merely to describe motion by describing its causes
22. v term for an object's resistance to start sliding
23. w True or False: Rough surfaces produce more friction than smooth surfaces.
24. x the strongest of the four fundamental forces that holds an atomic nucleus together
25. y A body in motion tends to move in a ____ ___ at a constant ____.
26. z law that states that every action has an opposite and equal reaction
27. aa term for the force exerted on an object's mass by the earth's gravity
28. ab 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
29. ac equation for weight
30. ad An object in ____ _____ can be overturned without changing the height of its center of gravity.
31. ae book by Isaac Newton that presented three laws of motion that still serve as the conceptual foundation of physics
32. af 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
33. ag 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.
34. ah 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
35. ai ____ is caused by unbalanced forces acting on the same object.
36. aj 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
37. ak The normal force always acts _____ to a surface.
38. al term for the one spot that represents the combined effect of gravity's influence on all the particles in an object
39. am Action and reaction are always opposite, equal, and along the same ___.
40. an term that means "earth-centered"
41. ao term for the closest position to the sun in a planet's orbit
42. ap term for a body's tendency to maintain its velocity, or a resistance to any change in velocity
43. aq term for any part of a machine that supports a moving part
44. ar term for the point in an object that describes the combined effect of all the individual particles of mass
45. as term for any push or pull on an object
46. at Greek astronomer who created a geocentric model of the solar system in the second century A.D.
47. au two types of friction
48. av sixteenth century Polish astronomer who proposed that sun was the center of the solar system
49. aw term for the time required for any planet to complete one orbit about the sun
50. ax two fundamental forces that might be basically different expressions of the same force
51. ay 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
52. az term for the science of mechanics that seeks to explain motion by describing its causes
53. ba An object in ____ _____ is not easily tipped over.
54. bb 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
55. bc Forces always occur in action-reaction ____.