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Thought-Process to Discover Knowledge

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User Guide

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figure-out, &
learn.

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User Guide

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nubtrek is designed to explain mathematics and science for young readers. Every topic consists of four sections.

nub,

trek,

jogger,

exercise.

User Guide

nub is the simple explanation of the concept.

This captures the small-core of concept in simple-plain English. The objective is to make the learner to think about.

User Guide

trek is the step by step exploration of the concept.

Trekking is bit hard, requiring one to sweat and exert. The benefits of taking the steps are awesome. In the trek, concepts are explained with exploratory questions and your thinking process is honed step by step.

User Guide

jogger provides the complete mathematical definition of the concepts.

This captures the essence of learning and helps one to review at a later point. The reference is available in pdf document too. This is designed to be viewed in a smart-phone screen.

User Guide

exercise provides practice problems to become fluent in the concepts.

This part does not have much content as of now. Over time, when resources are available, this section will have curated and exam-prep focused questions to test your knowledge.

summary of this topic

### Vector Dot Product

Voice

Voice

Home

Multiplication of Vectors

»  Two products because of orthogonality of components of vectors
→  dot product is defined for components in parallel vec p cdot vec q =vec p cdot vec a
→  cross product is defined for components in perpendicular vec p xx vec q =vec p xx vec b

### Multiplication of Vectors

plain and simple summary

nub

plain and simple summary

nub

dummy

When two vector quantities interact to form a product, either one of the (1) component in parallel or (2) component in perpendicular is involved in the multiplication. In practical scenarios, when one component interacts, the other component does not interact and is lost in the product.

simple steps to build the foundation

trek

simple steps to build the foundation

trek

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Starting on learning basics of "Multiplication of Vectors". ;; In this page, learn in detail about basics of vector multiplication.

What are the fundamental operations of mathematics?

• Multiplication and Division
• all the above

The answer is 'All the Above'. The four fundamental operations of mathematics are Addition, Subtraction, Multiplication, and Division.

We have studied about vector addition and multiplication of vectors by a scalar.

Is there something as vector multiplication?
That is the subject of learning in these pages. Let us go through some basics to understand vector multiplication.

Consider the vec p and vec q shown in figure. vec q is split into vec a and vec b, such that
vec q = vec a + vec b and
vec a is in parallel to vec p
vec b is in perpendicular to vec p
When the vectors vec p and vec q interact as a product which component(s) of vec q take part in the multiplication?

• only vec a
• only vec b
• either one : vec a or vec b
• both together : vec a and vec b

The answer is 'either one : vec a or vec b'. Remember the orthogonality of directions. When vectors interact to form products the interaction is either with the component in parallel or the component in perpendicular.

Orthogonality of Directions : Any change in a direction affects component along that direction only and does not affect the components in the directions at 90^@ to that direction.

The component which is in perpendicular to a direction does not affect the component in the direction. The directions which are at 90^@ angle are referred to as orthogonal directions.

In arithmetic operations like addition, subtraction, multiplication by a scalar, and product of vectors, – the results are computed for

•  components in parallel

•  components in perpendicular

Each of these two components interact differently.

comprehensive information for quick review

Jogger

comprehensive information for quick review

Jogger

dummy

How does direction affect vector quantities in multiplication? At an abstract level, there are two products possible. Given multiplicand vec p and multiplier vec q. vec q is split into vec a and vec b, such that
vec q = vec a + vec b and
vec a is in parallel to vec p
vec b is in perpendicular to vec p

two forms of multiplications are defined for each of these two components.

•  one with component in parallel to the other, called vector dot product.vec p cdot vec q = vec p cdot vec a

•  another with component in perpendicular to the vector, called vector cross product. vec p times vec q = vec p times vec b

practice questions to master the knowledge

Exercise

practice questions to master the knowledge

Exercise

Progress

Progress

What are the fundamental operations of mathematics?
multiplication;division
Multiplication and Division
all;above
all the above
The answer is 'All the Above'. The four fundamental operations of mathematics are Addition, Subtraction, Multiplication, and Division.
We have studied about vector addition and multiplication of vectors by a scalar.;; Is there something as vector multiplication? ; That is the subject of learning in these pages. Let us go through some basics to understand vector multiplication.
Consider the vector p and vector q shown in figure. Vector q is split into vector a and vector b, such that ;; vector q = vector a + vector b and ;; vector a is in parallel to vector p ;; vector b is in perpendicular to vector p. ;; When vectors p and q interact as a product which component or components of vector q take part in the multiplication?
1
2
3
4
The answer is "Either one : vector a or vector b". Remember the orthogonality of directions. When vectors interact to form products the interactionis either with the component in parallel or the component in perpendicular.
Orthogonality of Directions : Any change in a direction affects component along that direction only and does not affect the components in the directions at 90 degree to that direction. ;; The component which is in perpendicular to a direction does not affect the component in the direction. The directions which are at 90 degree angle are referred to as orthogonal directions.
In arithmetic operations like addition, subtraction, multiplication by a scalar, and product of vectors, – the results are computed for ;; components in parallel ;; components in perpendicular ;; Each of these two components interact differently.
When two vector quantities interact to form a product, either one of the ;; component in parallel or ;; component in perpendicular is involved in the multiplication. In practical scenarios, when one component interacts, the other component does not interact and is lost in the product.
How does direction affect vector quantities in multiplication? ;; At an abstract level, there are two products possible. Multiplicand vector p and multiplier vector q are given. ;; Vector q is split into vector a and vector b, such that vector q = vector a + vector b and ;; vector a is in parallel to vector p ;; vector b is in perpendicular to vector p. ;; two forms of multiplications are defined for each of these two components. ;; one with component in parallel to the other, called vector dot product. vector p dot vector q = vector p dot vector a ;; another with component in perpendicular to the vector, called vector cross product. vector p cross vector q = vector p cross vector b

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