UNDERSTANDING SPEED
When something moves it changes position
Motion and Position
-Descriptions of motion often include speed-how fast something moves
-Speed is an expression of how much time it takes for change in position to occur
-Any change over time is called a rate
-Speed-is the rate of change in position or "rate of motion"
-Instantaneous speed-the rate of motion at any given instant
-Constant Speed-a speed that does not vary
Changing Speed
-Average Speed-is the total distance traveled divided by total time of travel
CALCULATING SPEED
The relationship between distance, speed, and time is shown in the equation d=v x t, where d= distance, v = speed, and t = time. If you know the distance and time, you can rewrite the equation as v = d/t to calculate the average speed.
Graphing Speed
-A distance-time graph makes it possible to "see" motion
-When a line goes straight up or straight down then it is showing a constant speed
-If the line goes straight from left to right then there is no movement
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