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

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MOTION

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

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30; SECOND

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

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REFERENCE POINT

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

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**SI UNITS OF MEASUREMENT**

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

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METER

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

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ALL

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

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SPEED

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**08. Speed equals distance divided by ___.**

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TIME

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

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CONSTANT

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

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15 KMH

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

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DIRECTION

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

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AVERAGE

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

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25 KMH

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

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VELOCITY

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

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TIME

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

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STEEPNESS

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

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HORIZONTAL

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

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PLATES

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

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TECTONICS

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

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250

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

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25 METERS

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

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EQUAL

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

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SAME

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

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ACCELERATION

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

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ACCELERATION

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

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**DECELERATION OR NEGATIVE ACCELERATION**

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

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DIRECTION

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

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TIME

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

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HOUR PER HOUR

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

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STRAIGHT

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

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STATIONARY

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

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MOTION

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

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BICYCLE

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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 ___.

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SOUTH

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

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SPEED

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

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METER

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

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CONSTANT

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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 ___.

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VELOCITY

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

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KMH

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

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SLOPE

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

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TECTONICS

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

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CRUST

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

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VELOCITY

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

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**DECELERATION OR NEGATIVE ACCELERATION**

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

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ACCELERATES

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

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NEGATIVE

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

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m/s/s or m/s2

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

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km/h

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

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less

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

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-0.5 m/s/s

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PP Test Review Sections 6-1 to 6-6

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