Vectors 3-1C What is a vector? What are the properties of vectors? How can a vector be a mathematical model for a trip?

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Presentation transcript:

Vectors 3-1C What is a vector? What are the properties of vectors? How can a vector be a mathematical model for a trip?

Definition The vector AB is a model of the straight line path from point A to point B. A B Origin Endpoint A vector is a “directed” line segment, useful in describing paths. A vector looks like a ray, but it is NOT!! A vector has both direction and length.

Direction and Length From the school entrance, I went three blocks north. The distance is: Three blocks The direction is: North

Direction and Length The length of AB is the distance between A and B. The direction of a vector is measured counterclockwise from the horizonal (positive x-axis).

Drawing Vectors Draw vector YZ with direction of 45° and length of 10 cm. 1.Draw a horizontal dotted line 2.Use a protractor to draw 45° 3.Use a ruler to draw 10 cm 4.Label the points 45° Y Z 10 cm

Try It Turn to page 166 in your book. You will need a protractor and ruler. Direction 138° Length 2.7 cm

Vector Sum A path or trip that consists of several segments can be modeled by a sequence of vectors. The endpoint of one vector is the origin of the next vector in the chain. The figure shows a ship’s path from point M to point N that consists of five vectors. M S T U V N

Vector Sum What is the shortest path from M to N? Write the vector sum for the boat’s trip starting with MS M S T U V N

For vector sums, the following is true: XY + YZ = XZ X Y Z

Vector vs Ray How is a vector similar to a ray? Both have starting point and a direction. How is a vector different from a ray? A vector has a length: a ray goes on forever. vs Vector Ray

What is a vector? A vector is a directed line segment with a direction and length. What are the properties of vectors? Vectors have direction and length. How can a vector be a mathematical model for a trip? When you go on a trip, you go in a direction for a certain number of miles.

Assignment Page 168, 1-9, 17-21