Vectors Flashcards
1
Q
How to add vectors
A
Nose to tail
2
Q
Magnitude formula
A
Square root of components added ans squared
3
Q
How to calculate components of parallel unit vectors
A
- Find magnitude of given
- 1/ans multiplied by the coord
4
Q
What is the general rule for position vectors
A
AB ——> = b - a
5
Q
Vector collinearity
A
To show points A B and C are collinear we must show
- AB—> and BC —> are parallel e.g AB —> =kBC—>
- B is a common point to AB —> and BC—>
6
Q
If vectors are perpendicular
A
Dot product = 0
7
Q
If we take out a common factor from a vector and there is algebra
A
Divide the algebra by the common factor
8
Q
To find smaller vector inside a vector of a larger line
A
- calculate the length of the whole line using ratio
- take out the certain fraction of the smaller line you need from the whole length
- use the fraction eg 2/3 of the whole original line
