1. 01. When an object’s distance from another object is changing, it is in ___.

2. MOTION

3. 02. As Earth orbits the sun, it is moving about ___ kilometers per ___.

4. 30; SECOND

5. 03. A place or object used for comparison to determine if something is in motion is called a(n) ___.

6. REFERENCE POINT

7. 04. Liters, meters, and grams are all ___.

8. SI UNITS OF MEASUREMENT

9. 05. The basic SI unit of length is the ___.

10. METER

11. 06. The International System of Units is used ___ over the world.

12. ALL

13. 07. If you know the distance an object has traveled in a certain amount of time, you can determine the ___ of the object.

14. SPEED

15. 08. Speed equals distance divided by ___.

16. TIME

17. 09. If the speed of an object does NOT change, the object is traveling at a(n) ___ speed.

18. CONSTANT

19. 10. If a bicyclist travels 30 kilometers in two hours, her average speed is ___.

20. 15 KMH

21. 11. If an object moves in the same ___ and at a constant speed for 4 hours, the object’s velocity did not change.

22. DIRECTION

23. 12. If you know a car traveled 300 kilometers in 3 hours, you can find its ___ speed.

24. AVERAGE

25. 13. A train that travels 100 kilometers in 4 hours is traveling at what average speed?

26. 25 KMH

27. 14. When you know both the speed and the direction of an object’s motion, you know the ___ of the object.

28. VELOCITY

29. 15. You can show the motion of an object on a line graph in which you plot distance against ___.

30. TIME

31. 16. In graphing motion, the ___ of the slope depends on how quickly or slowly the object is moving.

32. STEEPNESS

33. 17. On a graph showing distance versus time, a ___ line represents an object that is not moving at all.

34. HORIZONTAL

35. 18. The upper layer of Earth consists of more than a dozen major pieces called ___.

36. PLATES

37. 19. According to the theory of plate ___, Earth’s plates move ever so slowly.

38. TECTONICS

39. 20. Scientists believe that Earth’s continents were connected as recently as ___ million years ago.

40. 250

41. 21. If one of Earth’s plates moves 5 centimeters every year, how many meters will it move in 500 years?

42. 25 METERS

43. 22. In a conversion factor, the denominator and numerator are ___.

44. EQUAL

45. 23. It is rare for any motion to stay the ___ for very long.

46. SAME

47. 24. The rate at which velocity changes is called ___.

48. ACCELERATION

49. 25. Changing direction is an example of a kind of ___.

50. ACCELERATION

51. 26. A car slowing down as it approaches a red light is an example of ___.

52. DECELERATION OR NEGATIVE ACCELERATION

53. 27. The moon accelerates because it is continuously changing ___.

54. DIRECTION

55. 28. To determine the acceleration rate of an object, you must calculate the change in velocity during each unit of ___.

56. TIME

57. 29. If velocity is measured in kilometers per hour and time is measured in hours, the unit of acceleration is kilometers per ___.

58. HOUR PER HOUR

59. 30. In an acceleration graph showing speed versus time, a ___ line shows the acceleration is constant.

60. STRAIGHT

61. 31. A reference point is assumed to be ___, or not moving.

62. STATIONARY

63. 32. A change in an object’s position relative to a reference point is called ___.

64. MOTION

65. 33. When riding a bicycle past a building, you are not moving relative to the ___.

66. BICYCLE

67. 34. Suppose you are sitting in a car at a red light when a car moving toward the north begins to pass you. If you use the passing car as a reference point, the direction in which you appear to be moving is toward the ___.

68. SOUTH

69. 35. The distance traveled by a moving object per unit of time is called ___.

70. SPEED

71. 36. The basic SI unit of length is ___.

72. METER

73. 37. Speed that does not change is referred to as ___ speed.

74. CONSTANT

75. 38. The statement that the motion of a hurricane is 20 kilometers per hour in an easterly direction is a description of the hurricane’s ___.

76. VELOCITY

77. 39. A speed of 15 kilometers per hour is abbreviated as 15 ___.

78. KMH

79. 40. If two lines appear on the same motion graph, the line with the steeper ___ indicates as greater speed.

80. SLOPE

81. 41. According to the theory of plate ____, Earth’s plates move very slowly in various directions.

82. TECTONICS

83. 42. The boundaries between the plates that make up the upper layer of the Earth are cracks in the Earths ___.

84. CRUST

85. 43. Acceleration is the rate of change in ___.

86. VELOCITY

87. 44. ___ occurs when an object slows down.

88. DECELERATION OR NEGATIVE ACCELERATION

89. 45. A golf ball ___ when either its speed or its direction changes.

90. ACCELERATES

91. 46. The motion of a car stopping at a traffic light is an example of ___ acceleration, also called deceleration.

92. NEGATIVE

93. 47. The abbreviation of the unit of acceleration (meters/second/second) is___.

94. m/s/s or m/s2

95. 48. If a ship has an acceleration of 3 kilometers per hour per hour, its speed is expressed in the unit of ___.

96. km/h

97. 49. If a car is speeding up, its initial speed is ___ than its final speed.

98. less

99. 50. If a train is traveling north at 30 m/s brakes to a stop in 1 minute, its acceleration is ___ southward.

100. -0.5 m/s/s