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

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

MOTION

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

30; SECOND

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

REFERENCE POINT

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

SI UNITS OF MEASUREMEN

T

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

METER

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

ALL

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

SPEED

08. Speed equals distance divided by ___.

TIME

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

CONSTANT

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

15 KMH

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

DIRECTION

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

AVERAGE

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

25 KMH

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

VELOCITY

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

TIME

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

STEEPNESS

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

HORIZONTAL

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

PLATES

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

TECTONICS

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

250

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

25 METERS

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

EQUAL

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

SAME

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

ACCELERATION

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

ACCELERATION

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

DECELERATION OR

NEGATIVE ACCELERATIO

N

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

DIRECTION

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

TIME

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

HOUR PER HOUR

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

STRAIGHT

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

STATIONARY

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

MOTION

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

BICYCLE

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 ___.

SOUTH

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

SPEED

36. The basic SI unit of length is ___.

METER

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

CONSTANT

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 ___.

VELOCITY

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

KMH

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

SLOPE

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

TECTONICS

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

CRUST

43. Acceleration is the rate of change in ___.

VELOCITY

44. ___ occurs when an object slows down.

DECELERATION OR NEGATIVE

ACCELERATION

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

ACCELERATES

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

NEGATIVE

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

m/s/s or m/s2

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

km/h

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

less

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

-0.5 m/s/s