Imagine you're a superhero with the power to fly in any direction. When you fly, you can go up/down, left/right, and forward/backward. Each flight is like a 3D vector! Now, if you take two flights one after another, the total distance you've traveled is like adding two 3D vectors together. That's what 3D vector addition is all about!
To add 3D vectors, we simply add the matching parts of each vector. It's like putting together puzzle pieces that fit perfectly. We add the x-parts together, the y-parts together, and the z-parts together. It's as easy as that!
If we have two 3D vectors \(\vec{a} = (a_x, a_y, a_z)\) and \(\vec{b} = (b_x, b_y, b_z)\), their sum \(\vec{c}\) is:
\[ \vec{c} = \vec{a} + \vec{b} = (a_x + b_x, a_y + b_y, a_z + b_z) \]
Where:
Let's add two superhero flights: \(\vec{a} = (3, 1, 2)\) and \(\vec{b} = (1, 4, -1)\)
So, after these two flights, our superhero has moved 4 units right, 5 units forward, and 1 unit up!
This picture shows our superhero's first flight \(\vec{a}\) (red), second flight \(\vec{b}\) (blue), and the total journey \(\vec{a}+\vec{b}\) (green) in 2D space, focusing on the x and y components.
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