Vectors in Component Form
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1 Vectors in Component Form Student Activity Introduction TI-Nspire & TI-Nspire CAS Investigation Student 30 min Vectors are used to represent quantities that have both magnitude and direction. There are a number of ways that 2D vectors can be represented. One of these representations involves expressing a vector r in terms of unit vectors i and j. This is known as component form and is expressed as r ai bj. Use the provided tns file and following information to help answer the questions. Equipment For this activity you will need a: TI-Nspire or TI-Nspire CAS TI-Nspire file: Vectors In Component Form Part of this investigation requires calculations to be performed. Add a Calculator application to perform these calculations. Visual Representation Open the TI-Nspire document Vectors In Component Form. Navigate to page: 1.2 by pressing /. Use the sliders to rotate the fixed vector around the Cartesian plane. (Note: Only use the sliders to change the magnitude and angle of the vector. Do not drag the vector as this will stop the file from working Notice that the top slider (mag) changes the magnitude (length) of the vector and the bottom slider (ang) changes the angle. Two angles are displayed on the screen. The outside angle represents the angle the vector makes with the positive direction of the horizontal axis and the inside angle is an internal angle of the right-angled triangle thus formed. At the bottom of the screen, the vector r is expressed in component form with magnitude and angle displayed. (Note: It is possible to click on the number given above each slider to change the magnitude and angle size, however do not change the vector by typing over the numbers at the bottom of the page Texas Instruments 2015 You may copy, communicate and modify this material for non-commercial educational purposes Author: S. Julian
2 Vectors In Component Form 2 Question: 1. Change the values of the sliders to produce a vector of magnitude 3 that makes an angle of 0 b) State where the vector is situated for this angle of 0? Question: 2. Change the values of the sliders to produce a vector of magnitude 3 that makes an angle of 90 b) State where the vector is situated for this angle of 90? Question: 3. Change the values of the sliders to produce a vector of magnitude 3 that makes an angle of 60 b) Which quadrant is the vector situated in for an angle of 60?
3 Vectors In Component Form 3 Question: 4. Change the values of the sliders to produce a vector of magnitude 3 that makes an angle of 150 b) Which quadrant is the vector situated in for an angle of 150? c) Using the answers you have obtained so far, where is the given (outside) angle being measured from? d) What is the magnitude of the i component representing? e) What is the magnitude of the j component representing? Question: 5. Change the values of the sliders to produce a vector of magnitude 5 that makes an angle of 310 b) Which quadrant is the vector situated for this angle of 310?
4 Vectors In Component Form 4 Numerical Representation Navigate to page: 1.3 by pressing /. Page: 1.3 displays the magnitude of the i and j components that are shown on page: 1.2. Question: 6. a) Explain why cosine can be used to find the a-value (the magnitude of the i component)? b) Explain why sine can be used to find the b-value (the magnitude of the j component)? c) Explain why the magnitude of the vector r can be calculated using: a b. 2 2
5 Vectors In Component Form 5 Question: 7. Using your findings from Question: 6, determine a rule that can be used to find the component form of a vector given the magnitude of the vector r and the angle it makes with the positive direction of the horizontal axis measured in an anti-clockwise direction, θ. Navigate to page: 1.4 Confirm your answer for Question: 7. Extension Questions Without the use of the TI-Nspire document Vectors In Component Form, answer the following questions. Then use the Vectors In Component Form file to check your answers. Question: 8. Express each of the following magnitudes and angles as a vector in component form. a) Magnitude = 1 and Angle = 20 b) Magnitude = 2.5 and Angle = 130 c) Magnitude = 4 and Angle = 260 d) Magnitude = 3.5 and Angle = 330
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