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Vector Subtraction Flashcards
GCSE Mathematics (Edexcel) 1MA1
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Vector subtraction
The process of finding the difference between two vectors by subtracting their corresponding components.
Subtracting column vectors
To subtract column vectors, subtract the corresponding components: (a, b) - (c, d) = (a - c, b - d).
Resultant vector
The vector obtained after performing vector subtraction, representing the difference between two vectors.
Geometric interpretation of vector subtraction
Vector subtraction can be visualised as the vector from the tip of the second vector to the tip of the first vector.
Negative of a vector
The negative of a vector reverses its direction. For example, -v is the same magnitude as v but in the opposite direction.
Subtracting vectors using position vectors
To subtract position vectors, subtract the coordinates of the second point from the first point.
Vector subtraction in component form
If u = (x₁, y₁) and v = (x₂, y₂), then u - v = (x₁ - x₂, y₁ - y₂).
Subtracting vectors graphically
To subtract vectors graphically, place the tail of the second vector at the head of the first vector, then draw the resultant vector.
Difference between vector addition and subtraction
Vector addition combines two vectors, while vector subtraction finds the difference between them.
Practical example of vector subtraction
If a plane's velocity is (200, 50) and the wind's velocity is (30, 10), the resultant velocity is (200 - 30, 50 - 10) = (170, 40).

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