Activity 1.11 - Introduction to Vectors Part 2 In Introduction to Vectors Part 1, we focused on understanding vector notation, the definition of unit vectors, how to add and subtract vectors, multiply vectors by scalars, and how to find the magnitude and direction of a vector if we know their components. In Part II, we will focus on how to break up a vector into components, that is how to find the components of a vector if we know the magnitude and direction of a vector. You will be applying your basic trigonometry relations for right angles. For example, in a right triangle, we know Jadj| and sin hyp where adj and are the sides adjacent and opposite the angle and hyp is the hypothenuse. Therefore, you can determine the magnitudes of the adjacent and opposite sides to an angle in a right triangle by |ad)| = hyp X cas 8 and app|hypx sin 8 You then put in the sign of the components by hand. The easiest way to see how this works is to go through an example. cos loppl hyp EXAMPLE: Sarah first walks 14 meters in a direction 30° west of south. She then turns and walks 20 meters at 36.87" east of south. Let F be the first displacement and be the second. The vector is drawn to the right (not to scale). The dashed arrows are the component triangle for which is used to help you identify the x and y components. a. Determine the x and y components of F. Start by using trigonometry to find the magnitudes of the components. Then use the component triangle to add in the signs by hand. Always check that the signs of the components agree with the component triangle. b. Draw the displacement with its tail at the head of F. c. Use dashed lines (with arrows) to draw the component triangle for 7. Label which angle is 36.87". F 14 m 40 E LIK +x
Activity 1.11 - Introduction to Vectors Part 2 In Introduction to Vectors Part 1, we focused on understanding vector notation, the definition of unit vectors, how to add and subtract vectors, multiply vectors by scalars, and how to find the magnitude and direction of a vector if we know their components. In Part II, we will focus on how to break up a vector into components, that is how to find the components of a vector if we know the magnitude and direction of a vector. You will be applying your basic trigonometry relations for right angles. For example, in a right triangle, we know Jadj| and sin hyp where adj and are the sides adjacent and opposite the angle and hyp is the hypothenuse. Therefore, you can determine the magnitudes of the adjacent and opposite sides to an angle in a right triangle by |ad)| = hyp X cas 8 and app|hypx sin 8 You then put in the sign of the components by hand. The easiest way to see how this works is to go through an example. cos loppl hyp EXAMPLE: Sarah first walks 14 meters in a direction 30° west of south. She then turns and walks 20 meters at 36.87" east of south. Let F be the first displacement and be the second. The vector is drawn to the right (not to scale). The dashed arrows are the component triangle for which is used to help you identify the x and y components. a. Determine the x and y components of F. Start by using trigonometry to find the magnitudes of the components. Then use the component triangle to add in the signs by hand. Always check that the signs of the components agree with the component triangle. b. Draw the displacement with its tail at the head of F. c. Use dashed lines (with arrows) to draw the component triangle for 7. Label which angle is 36.87". F 14 m 40 E LIK +x
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter1: Introduction And Vectors
Section: Chapter Questions
Problem 43P
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