Dot Product So far, we haven’t talked about how to multiply two vectors…because there are two ways to “multiply” them. Def. Let and, then the dot product.

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Presentation transcript:

Dot Product So far, we haven’t talked about how to multiply two vectors…because there are two ways to “multiply” them. Def. Let and, then the dot product is This is also called the scalar product, since the result is a scalar

Ex. Find the dot product a) b) (i + 2j – 3k) ∙ (2j – k)

Properties of the Dot Product 1) a ∙ a = |a| 2 2) a ∙ b = b ∙ a 3) a ∙ (b + c) = a ∙ b + a ∙ c 4) (ca) ∙ b = c(a ∙ b) = a ∙ (cb) 5) 0 ∙ a = 0

Dot product is used to find the angle between two vectors: Thm. If θ is the angle between a and b, then Ex. Find the angle between and

Ex. Consider the points A(3,1), B(-2,3) and C(-1,-3). Find m  ABC.

Thm. Two vectors a and b are orthogonal if a ∙ b = 0. Orthogonal = Perpendicular = Normal Ex. Show that 2i + 2j – k and 5i – 4j + 2k are orthogonal

The direction angles of a vector a are the angles α, β, and γ that a makes with the positive x-, y-, and z-axes, respectively. Consider α… It’s the angle with the x-axis, so it’s the angle with i.

These are called the direction cosines of a.

Ex. Find the direction angles of

The vector projection of b onto a, written proj a b, is the “shadow” that is cast by b onto a The scalar projection (also called the component) is the magnitude of the projection

Let’s find comp a b

Ex. Find the scalar and vector projections of onto