MOTION. Chapter Four: Motion  4.1 Position, Speed and Velocity  4.2 Graphs of Motion  4.3 Acceleration.

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Presentation transcript:

MOTION

Chapter Four: Motion  4.1 Position, Speed and Velocity  4.2 Graphs of Motion  4.3 Acceleration

4.2 Graphs of Motion  Constant speed means the speed stays the same.  An object moving at a constant speed always creates a position vs. time graph that is a straight line.

4.2 Graphs of Motion  The data shows the runner took 10 seconds to run each 50-meter segment.  Because the time was the same for each segment, you know the speed was the same for each segment.

4.2 Graphs of Motion  You can use position vs. time graphs to compare the motion of different objects.  The steeper line on a position vs. time graph means a faster speed.

4.2 Slope  The steepness of a line is measured by finding its slope.  The slope of a line is the ratio of the “rise” to the “run”.

4.2 Graphs of changing motion  Objects rarely move at the same speed for a long period of time.  A speed vs. time graph is also useful for showing the motion of an object that is speeding up or slowing down.

4.2 Graphs of changing motion  Suppose we draw a rectangle on the speed vs. time graph between the x- axis and the line showing the speed.  The area of the rectangle is equal to its length times its height.  On the graph, the length is equal to the time and the height is equal to the speed.