Science:: CHAPTER 1- MOTION
Terms
undefined, object
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- When is an object in motion?
- When its distance from a reference point is changing
- What is a reference point?
- a place/object used to determine if something is in motion
- How can you tell if an object is in motion?
- When its postion changes relative to a reference point
- What does SI stand for?
- International System of Units
- What is the SI basic unit of length?
- Meter
- How would you find the average speed?
- Divide total distance by total time
- What is velocity?
- Speed in a given direction
- What is a slope?
- The steepness of a line on a graph
- Earth's rocky outer shell is in..
- several pieces.
- What are plates?
- The upper layer of Earth that consists of more than a dozen pieces
- What is the theory of plate tectonics?
- Earth's plates move ever so slowly in various directions
- What do Earth's plates do?
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-Push toward each other
-Slide past each other
-Pull away from each other - By knowing the average speed of a plate, what can scientists estimate about Earth's continents?
- They can estimate of how the continents moved in the past, present, and in the future.
- What is acceleration?
- The rate at which velocity changes
- Acceleration involves a chang ein what two components?
- Speed & direction
- What is another word for negative acceleration?
- Deacceleration
- When does an object experience accerlation?
- Any time th espeed of an object increases
- Can an object be accelerating even if the speed is constant? Why?
- Yes, because the object is changing direction
- What must you calculate to determine the acceleration of an object?
- Calculate the change in velocity during each unit of time
- What is a linear relationship on a speed graph? What does it mean?
- The line is straight; acceleration is constant
- What is a nonlinear relationship? What does it mean?
- The line is curved; acceleration varies over time