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Unformatted text preview: Y A ) j + ( Z B – Z A ) k }m Please note that B is the ending point and A is the starting point. So ALWAYS subtract the “tail” coordinates from the “tip” coordinates! FORCE VECTOR DIRECTED ALONG A LINE (Section 2.8) If a force is directed along a line, then we can represent the force vector in Cartesian Coordinates by using a unit vector and the force magnitude. So we need to: a) Find the position vector, r AB , along two points on that line. b) Find the unit vector describing the line’s direction, u AB = ( r AB /r AB ). c) Multiply the unit vector by the magnitude of the force, F = F u AB ....
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 Spring '10
 brr
 position vector

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