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