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UNIT TWO: Motion, Force, and Energy

UNIT TWO: Motion, Force, and Energy. Chapter 4 Motion Chapter 5 Force Chapter 6 Newton’s Laws of Motion Chapter 7 Work and Energy. Chapter Four: Motion. 4.1 Speed and Velocity 4.2 Graphs of Motion 4.3 Acceleration. Section 4.2 Learning Goals.

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UNIT TWO: Motion, Force, and Energy

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  1. UNIT TWO: Motion, Force, and Energy • Chapter 4 Motion • Chapter 5 Force • Chapter 6 Newton’s Laws of Motion • Chapter 7 Work and Energy

  2. Chapter Four: Motion • 4.1 Speed and Velocity • 4.2 Graphs of Motion • 4.3 Acceleration

  3. Section 4.2 Learning Goals • Construct and analyze graphs of position versus time, and speed versus time. • Recognize and explain how the slope of a line describes the motion of an object. • Explain the meaning of constant speed.

  4. Key Question: Can you predict the speed of the car as it moves down the track? Investigation 4A Speed

  5. 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.

  6. 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.

  7. 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.

  8. 4.2 Slope • The slopeof a line is the ratio of the “rise” to the “run”. • The steepness of a line is measured by finding its slope.

  9. 4.2 Calculating distance • On the graph, the length is equal to the time and the height is equal to the speed. • The area of the rectangle is equal to its length times its height. • Suppose we draw a rectangle on the speed vs. time graph between the x-axis and the line showing the speed.

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