MPCS 9th Science Ch 11 Test
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Created by:
erichardson008 on February 4, 2009
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21 terms
Terms | Definitions |
|---|---|
 Name 3 vector quantities. | displacement, direction, velocity |
| What is the displacement of a person who walks around the block and ends up where they started? | The displacement doesn't move to a straight location. |
| What is the RATIO of the distance traveled by an object to the time an object takes to travel that distance? | average speed or v = d/t |
| Explain instantaneous speed. | The rate at which an object is moving at a given moment in time. The speed is always moving at a constant. The car's speedometer measures its instantaneous speed. |
| Compare instantaneous speed to average speed. | Averrage speed is computed for the ENTIRE duration of a trip, and instananeous speed is measured at a particular instant. |
| What is the unit for speed? | meters per second (m/s) |
| What is the unit for distance? | meter |
| What is the unit for velocity? | kilometers per hour km/h |
| What is the unit for displacement? | any measurement of length |
| What does a horizontal line on a distance time graph represent about the motion of an object? | It is not moving. |
| What is the rate at which velocity changes? | Acceleration |
| List two ways in which an object can accelerate. | Speed and direction |
| What is displacement? | The direction from the starting point and the length of a straight line from the starting point to teh ending point. |
| Vectors are quantities that have what two things? | magnitude and direction |
| What do you call the vector that is the sum of two or more vector? | resultant vector |
| What is the displacement of a boy who moves 5 feet east and then 3 feet west? | 5 feet - 3 feet = 2 feet (Add when they are going in the same direction and subtract when going in opposite directions) |
| What is the total distance of a boy who moves 5 feet east and then 3 feet west? | 8 feet (Because he moved his feet a total of 8 feet) |
| If your initial speed is 5 m/s and you accelerate to a speed of 12 m/s in 4 seconds, what is your acceleration? | 7 m/s (5 + what = 12) |
| An object moving at 30 m/s comes to a stop in 5 seconds. What is the objects acceleration? | 6 m/s (30 divided by 5) |
| During a race, a runner running at a speed of 6 m/s increases her speed to 10 m/s in 4 seconds. What is her acceleration? | 4 m/s (6 plus what = 10) |
| Tell a story about a person's motion that results in that person traveling a total of 100 meters, but having a displacement of zero. | It is like a person who walks or runs around a block of their neighborhood, starting at their house, circling the block, and ending back up at their house. |
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