9 grade science> what are vectors? I need the full topic o...

what are vectors?I need the full topic of Vectors and thier sums.

RAJEEV R , 9 Years ago

Grade 9

3 Answers

Hinal Srivastava

Last Activity: 9 Years ago

a quantity having direction as well as magnitude, especially as determining the position of one point in space relative to another.is called a vector

Approved

Neeti

Last Activity: 9 Years ago

Vector is any quantity which has a magnitude and a direction. It is depicted by an arrow with the arrow head pointing towards the direction of the vector.

Example of a vector would be, force, velocity ( while speed is a scalar, and has magnitude only) , displacement (while distance has magnitude only).

When two vectors A and B are present touching each other at their base, making an angle $\Theta$ with each other,

The magnitude of the resultant is given by

R = (A² + B² + 2AB cos $\Theta$ )^1/2 , and the direction of the resultant R given in terms of angle made by it with one of the vectors is:

tan $\Phi$ = A sin $\Theta$ / B + A cos $\Theta$ where $\Phi$ is the angle between resultant R and vector B.

Please feel free to ask any follow up question and approve the answer if you like it :)

A M S ARUN KRISHNA

Last Activity: 9 Years ago

To specify some physical quantity magnitude and directions are needed and also obey laws of vector addition is called vector quantity
Example : displacement, velocity, acceleration, weight (5N means magnitude 5 and direction is vertically downwards
Current does not follow vector addition so it is a scalar quantity
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