Mathematics Grade 10 15 min

Find the component form of a vector given its magnitude and direction angle

Find the component form of a vector given its magnitude and direction angle

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Introduction & Learning Objectives

Learning Objectives Define vector, magnitude, direction angle, and component form. Identify the magnitude and direction angle from a vector's description. Recall and apply the formulas for calculating the horizontal (x) and vertical (y) components of a vector. Use a calculator correctly to find the cosine and sine of angles given in degrees. Convert a vector from its magnitude and direction angle form into its component form <x, y>. Sketch a vector in the coordinate plane to visualize its components and verify the signs of their answers. Ever wonder how a video game character's movement is programmed? 🎮 It's all about breaking down a single instruction, like 'move forward at this speed', into simple left/right and up/down commands! In this tu...
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Key Concepts & Vocabulary

TermDefinitionExample VectorA quantity that has both magnitude (size or length) and direction.A velocity of 25 m/s at an angle of 30°. MagnitudeThe length or size of a vector, often representing its strength or speed. It is always a non-negative value. The magnitude of vector **v** is written as ||**v**||.If a force vector is 50 Newtons, its magnitude is 50. Direction Angle (θ)The angle that a vector in standard position (starting at the origin) makes with the positive x-axis, measured counterclockwise.A vector pointing directly to the right has a direction angle of 0°. A vector pointing straight up has a direction angle of 90°. Component FormA way of writing a vector by listing its horizontal (x) and vertical (y) components. It is written as **v** = <x, y>.The vector <3, -4>...
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Core Formulas

Formula for the Horizontal Component (x) x = ||v|| * cos(θ) To find the horizontal component of a vector, multiply its magnitude by the cosine of its direction angle. This formula comes from right-triangle trigonometry, where the x-component is the side adjacent to the angle θ. Formula for the Vertical Component (y) y = ||v|| * sin(θ) To find the vertical component of a vector, multiply its magnitude by the sine of its direction angle. This formula also comes from right-triangle trigonometry, where the y-component is the side opposite the angle θ. The Complete Component Form Formula v = <x, y> = <||v|| * cos(θ), ||v|| * sin(θ)> This combines the two previous formulas to directly express the vector **v** in its component form using its magnitude and direct...

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Sample Practice Questions

Challenging
A vector in Quadrant I has a magnitude of 13 and a vertical component of 5. What is its horizontal component?
A.8
B.12
C.14
D.18
Challenging
The component form of a vector is <x, y>, where x and y are positive and x = y. What is the direction angle θ of the vector?
A.30°
B.45°
C.60°
D.90°
Challenging
The vertical component of a non-zero vector **v** is 0. What are the possible direction angles (θ) for this vector, where 0° ≤ θ < 360°?
A.90° or 270°
B.45° or 225°
C.0° or 180°
D.180° or 270°

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Find the component form of a vector given its magnitude and direction angle

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