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of 59 available terms

### 59 True/False questions

1. TrueAction and reaction are always opposite, equal, and along the same ___.

2. Motionterm for the time required for any planet to complete one orbit about the sun

3. Newton's first law of motionlaw that states that every action has an opposite and equal reaction

4. gravitational forceScientist 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.

5. kinetic frictionterm 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

6. heliocentricThe _____ ("sun-centered") model of the solar system has become the foundation of modern astronomy.

7. geocentricThe _____ ("sun-centered") model of the solar system has become the foundation of modern astronomy.

8. weightterm for the force exerted on an object's mass by the earth's gravity

9. minimizing roughness; choosing suitable materials; lubricating; and rollers and bearingsfour methods of reducing friction on a surface

10. friction____ is caused by unbalanced forces acting on the same object.

11. gravitational field strengthScientist 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.

12. unstable equilibriumAn object in ____ _____ is upset at the slightest disturbance.

13. weightAction and reaction are always opposite, equal, and along the same ___.

14. Newton's third law of motionthe 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

15. universal law of gravitationlaw 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

16. static friction and kinetic frictiontwo types of friction

17. gravitationterm for the attractive force that exists between any two masses

18. stable equilibriumAn object in ____ _____ is upset at the slightest disturbance.

19. instabilityterm 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

20. law of orbitslaw 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

21. FalseTrue or False: Kinetic friction is dependent on velocity.

22. law of areaslaw 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

23. aphelionterm for the time required for any planet to complete one orbit about the sun

24. multiple suspensionslaw 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

25. center of massterm for rest mass

26. gravityterm for any part of a machine that supports a moving part

27. strong force, electromagnetic force, weak force, and gravitational forcethe four fundamental forces of nature (from strongest to weakest)

28. normal forcethe fundamental force responsible for certain particle interactions in the radioactive decay of atomic nuclei

29. lineAction and reaction are always opposite, equal, and along the same ___.

30. Fw = mgequation for weight

31. gravitational fieldScientist 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.

32. Nicolaus Copernicussixteenth century Polish astronomer who proposed that sun was the center of the solar system

33. center of gravity (CG)term for the one spot that represents the combined effect of gravity's influence on all the particles in an object

34. strong forcethe fundamental force responsible for certain particle interactions in the radioactive decay of atomic nuclei

35. inertial massterm for rest mass

36. bearingterm for any part of a machine that supports a moving part

37. neutral equilibriumAn object in ____ _____ can be overturned without changing the height of its center of gravity.

38. inertiaterm for the science of mechanics that seeks merely to describe motion by describing its causes

39. dynamicsForces always occur in action-reaction ____.

40. Principia Mathematicaterm for the science of mechanics that seeks merely to describe motion by describing its causes

41. FalseTrue or False: Kinetic friction is dependent on the area of contact between the surfaces.

42. law of periodslaw 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

43. kinematicsterm for the science of mechanics that seeks merely to describe motion by describing its causes

44. F = maequation for weight

45. weak forcethe fundamental force responsible for certain particle interactions in the radioactive decay of atomic nuclei

46. pairsterm for the time required for any planet to complete one orbit about the sun

47. TrueTrue or False: 'Gravitation' and 'gravity' do not mean the same thing.

48. straight line, speedA body in motion tends to move in a ____ ___ at a constant ____.

49. electromagnetic force and weak forcetwo fundamental forces that might be basically different expressions of the same force

50. perpendicularterm for the time required for any planet to complete one orbit about the sun

51. forceTrue or False: Kinetic friction is dependent on the area of contact between the surfaces.

52. PtolemyTrue or False: Rough surfaces produce more friction than smooth surfaces.

53. static equilibriumAn object that remains at rest within earth's gravitational field is said to be in ____ _______.

54. forceTrue or False: Rough surfaces produce more friction than smooth surfaces.

55. static frictionterm for an object's resistance to start sliding

56. periodterm for the farthest position from the sun in a planet's orbit

57. electromagnetic forcethe 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

58. law of orbits, law of areas, and law of periodsthe 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

59. perihelionterm for the farthest position from the sun in a planet's orbit