Form 5 Mathematics Displacement & Position vectors.
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Transcript of Form 5 Mathematics Displacement & Position vectors.
Amy lives at (2,1)
Amy
Betty
Cindy
A
Betty lives at (4,6)
B
Cindy lives at (-3,2)
C
What is the vector to get from Amy to Betty?
25( )
When Amy gets to Betty’s house they then wants to go to Cindy’s house.What is the vector from Betty to Cindy? ( )-7
-4
What vector represents Amy travelling to Cindy’s house?
( )-51
Recap of Amy’s travels
A
B
C
AB= ( 25)
BC= (-7-4)
AC= (-51)
Do you notice a relationship between the first two vectors above and AC?
AC is the resultant vector of AB and BC. We represent this by putting a second arrow on the vector.
Luke, Matthew and Nicholas
Luke
Matthew
Nicholas
• Luke lives at (3,-2)
• Matthew lives at (-5,-2)
• Nicholas lives at (3,4)
Plot L, M & N.
Luke, Matthew and Nicholas
LM
NLuke
Matthew
Nicholas
Luke, Matthew and Nicholas
Luke
Matthew
Nicholas
What is the vector LM? LM= (-8 0 )
What is the vector MN? MN=( 86)
What is the resultant vector LN? LN= ( 06)
Draw these vectors on your graph. (Remember to use two arrows on your resultant vector.)
Position Vectors
A position vector is a vector whose initial point is the origin.
Where is the origin?
For example…
O
D
This is the position vector OD.
Amy, Betty & Cindy
Amy
Betty
Cindy
A
B
C
Suppose Amy, Betty and Cindy could only get to each others houses by going to the bus station.
O
Amy
BettyCindy
A
B
C
O
AB=AO + OB
AB is made up of two position vectors.OA and OB.
What is the relationship between AO and OA?
Split AC into two position vectors.
Do you notice a relationship between the coordinates of A and the position vector OA?
Let us try this question!
If is A(2,3), B(5,4) and C(-1,3),
Calculate OA, OB and OC.
Calculate AB.
Calculate BC.
Calculate AC.