Vectors - Scalar and Vector Projections
Example: Find the scalar projection of U and of V given by:
U = i + j + k and V = 3 i + 4 j
V = √ [ (3)2 + (4)2 ] = √5
compV U = U · V / V = [ (1)(3) + (1)(4) ] / 5 = 7 / 5 (result)
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Example: Find the vector projection of U onto V given by:
V = √ [ (3)2 + (4)2 ] = 5
Recall projV U = ( U ∙ V ) eV
U · V = (1)(3) + (1) (4) = 7, U · V / V = 7 / 5
eV = ( 3 i + 4 j ) / 5
projV U = ( U ∙ V ) eV = (7 / 25) [ 3i + 4j ] (result)
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