Science Test
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| Acceleration involves a change in what two components? | speed and direction
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| Any time the speed of an object increases, the object expierences | acceleration
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| Is the following sentence true or false? Acceleration refers to increasing speed, decreasing speed, or changing direction. | true
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| Deceleration is another word for negative | acceleration
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| Is the following sentence true or false? An object can accelerating even if the speed is constant | true
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| Give some examples of an something that accelerates at a constant speed | a merry go round, ferris wheel, the moon orbiting around the earth
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| The phrase "speeding up" in scientific language is known as | increasing speed
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| The phrase "slowing down" in scientific language is known as | decreasing speed
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| The word "turning" in scientific language is known as | changing direction
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| What must you calculate to determine the acceleration of an object? | you must calculate the change in velocity during each unit of time
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| What is the formula you use to determine acceleration? | Acceleration = Final Velocity - Initial Velocity divided by Time
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| What is true about calculating the acceleration of a moving object? | If an object's acceleration varies, then you can describe only average acceleration
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| Suppose velocity is measured in kilometers/hour and time is measured in hours. What is the unit of acceleration? | km/hr/hr
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| A graph shows the motion of an object that is accelerating. What happens to the speed of an object over time? | the speed of the object increases over time
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| The graph line is slanted and straight. What does this line show about the acceleration of an object? | it shows that the acceleration of the object has an acceleration that is constant
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| What is true when a graph of distance versus time is a curved line | the distance traveled by the object varies each second
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| When an object's distance from another object is changing, | its in motion
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| The basic SI unit of length is the | meter
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| Speed equals distance divided by | time
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| When you know both the speed and direction of an object's in motion, you know the | velocity of an object
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| You can show the motion of an object on a line graph in which you plot distance against | time
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| In graphing motion, the steepness of the slope depends on | how quickly or slowly the object is moving
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| The upper layer of Earth consists of more than a dozen major pieces called | plates
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| In 1,000 years, Earth's plates have moved | 50 meters
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| What is an example of deceleration? | a car approaching a red light
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| A place or an object used for comparison to determine if an object is in motion is called | a reference point
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| Gallons, inches, and pounds are all | units
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| On a graph showing distance vs. time, a horizontal line represents an object that is | not moving at all
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| The International System of Units is used | all over the world
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| According to the theory of plate tectonics, | earth's plates move ever so slowly
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| Scientists believe that all continents were connected as recently as | 250 million years ago
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| If you know the distance an object has traveled in a certain amount of time, you can determine | the speed of an object
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| In a conversion factor, what is special about the fraction used? | the denominator and numerator are equal
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| It is rare for any motion to | stay the same for very long
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| If a bicyclist travels 30 kilometers in two hours, her average speed would be | 15 km/h
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| A reference point is assumed to be ______or not moving | stationary
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| A change in an object's position relative to a reference point is called_____ | motion
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| When riding a bicycle past a building, you are not moving relative to the_______ | bicycle
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| Suppose you are standing on a corner when a car moving toward the north passes you. If you use the car as a reference point, the direction in which you appear to be moving is toward the____ | south
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| The distance traveled by a moving object per unit of time is called____ | speed
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| The boundaries between the plates that make up the upper layer of Earth are cracks in the Earth's | crust
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| Acceleration is the rate of change in____ | velocity
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| _____occurs when an object slows down | deceleration
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| If a car is speeding up, its initial speed is ____than its final speed | less
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| If two lines appear on the same motion graph, the line with the steeper____indicates a greater speed. | slope
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