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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 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 G. Label which angle is 36.87"

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 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 G. Label which angle is 36.87"

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Activity 1.11 - Introduction to Vectors Part 2 In Introduction to Vectors Part I, 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 lopp sin 8 = hyp ladj cos 8 = hyp and where adj and opp are the sides adjacent and opposite the angle 8 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 |adj|= hyp x cose and opp = 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. 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 be the first displacement and scale). The dashed arrows are the component triangle for which is used to help you identify the x and y components. be the second. The vector F is drawn to the right (not to 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 G. Label which angle is 36.87⁰. d. Use trigonometry to find the x and y components of G. Always check that the signs of the components agree with the component triangle. F 다. 30 14 m W+ N +y E e. You can also obtain the component by measuring the angle from the +x axis with counterclockwise (ccw) counted as positive and clockwise (cw) counted as negative. This means +y is 90° and -x is 180°. The -y direction can be written as either 270° or-90°. Using this convention, the x and y component of any vector à are then just A₂ = A cos & and A, = A sine where A is the magnitude of A. Note that this method only works if you use a standard coordinate system where +y is 90° cew from +x. i. What is the angle that makes with respect to the +x axis? A 30° 14 m *+ +y N g. Give the direction of the resultant R in terms of an angle less than 90 degrees relative to a compass direction, for example, 10° south of east. Comment: always draw the vector, check that your answer agrees with your diagram. E ii Use this angle to determine the x and y components of F. Make sure it agrees with your previous result. iii. The vector G was 20 meters at 36.87° east of south. What is the angle this vector makes with the + axis? Use this angle to calculate the x and y components of G and check that it agrees with your previous calculations. f. What is the magnitude of the resultant R=F+G? Comment: even though the question asks for magnitude, you cannot add magnitudes of vectors. You must add the vectors using the components first and then use the components of the result to find the magnitude.
Transcribed Image Text:Activity 1.11 - Introduction to Vectors Part 2 In Introduction to Vectors Part I, 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 lopp sin 8 = hyp ladj cos 8 = hyp and where adj and opp are the sides adjacent and opposite the angle 8 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 |adj|= hyp x cose and opp = 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. 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 be the first displacement and scale). The dashed arrows are the component triangle for which is used to help you identify the x and y components. be the second. The vector F is drawn to the right (not to 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 G. Label which angle is 36.87⁰. d. Use trigonometry to find the x and y components of G. Always check that the signs of the components agree with the component triangle. F 다. 30 14 m W+ N +y E e. You can also obtain the component by measuring the angle from the +x axis with counterclockwise (ccw) counted as positive and clockwise (cw) counted as negative. This means +y is 90° and -x is 180°. The -y direction can be written as either 270° or-90°. Using this convention, the x and y component of any vector à are then just A₂ = A cos & and A, = A sine where A is the magnitude of A. Note that this method only works if you use a standard coordinate system where +y is 90° cew from +x. i. What is the angle that makes with respect to the +x axis? A 30° 14 m *+ +y N g. Give the direction of the resultant R in terms of an angle less than 90 degrees relative to a compass direction, for example, 10° south of east. Comment: always draw the vector, check that your answer agrees with your diagram. E ii Use this angle to determine the x and y components of F. Make sure it agrees with your previous result. iii. The vector G was 20 meters at 36.87° east of south. What is the angle this vector makes with the + axis? Use this angle to calculate the x and y components of G and check that it agrees with your previous calculations. f. What is the magnitude of the resultant R=F+G? Comment: even though the question asks for magnitude, you cannot add magnitudes of vectors. You must add the vectors using the components first and then use the components of the result to find the magnitude.
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