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Understanding Object Position and Motion

Learn about describing an object's position relative to a reference point, using two dimensions, and the difference between distance and displacement. Motion involves changing position, with displacement representing the final position difference.

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Understanding Object Position and Motion

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  1. Describing motion

  2. How does the description of an object’s position depend on a reference point? • How can you describe the position of an object in two dimensions? • What is the difference between distance and displacement?

  3. A reference point is a starting point that can be used to locate a place or thing. • A position is an object’s distance in a certain direction from a reference point.

  4. A complete description of your position includes a distance, a direction, and a reference point.

  5. Describing Position(cont.) The reference direction is the positive (+) direction and the opposite direction is the negative (-) direction. Lesson 1-1

  6. Describing Position in Two Dimensions • When you describe a position using two directions, you are using two dimensions. • To find a position in two dimensions you must choose a reference point, specify reference directions, and then determine the distance along each reference direction.

  7. Describing Changes in Position Motion is the process of changing position. motion from Latin motere, means “to move”

  8. The man in the boat is not in motion compared to his fishing pole. He is in motion compared to the buoy. Lesson 1-3

  9. Describing Changes in Position(cont.) • Displacement is the difference between the initial (first) position and the final position of an object. • Distance depends on the path taken. • Displacement depends only on the initial and final positions.

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