Vectors

177.
In the diagram, X and Y are midpoints of AC and BC respectively.
AC ⃗ = p and BC ⃗ = q .
A B C X Y p q
(a) In terms of p and/or q, find:
(i) XA ⃗ ,
(a)(i) ......................... [1]
(ii) AB ⃗ .
(a)(ii) ......................... [1]
(b) Show that XY ⃗ and AB ⃗ are parallel.
(b) ......................... [2]
Paper 2
178.
The diagram shows triangle APQ.
AP ⃗ = p and AQ ⃗ = q and P B = 1 3 P Q .
A P Q B p q NOT TO SCALE
Find AB ⃗ in terms of p and q, giving your answer in its simplest form.
AB = ......................... [3]
Paper 2
179.
The diagram shows DEFNM and its image ABCNM after a reflection along the line NM.
AB = BC = CN = AM and C N ˆ M = A M ˆ N = 90 O .
A B C D E F M N a b c NOT TO SCALE
Expressing your answer, in terms of a, b and/or c, in simplest form, find:
(a) MC ⃗ ,
(a) ......................... [1]
(b) MF ⃗ ,
(b) ......................... [1]
(c) FB ⃗ .
(c) ......................... [1]
Paper 2
62.
In the diagram, Q → R = a and S → T = b .
R is the point on QS such that Q → S = 3 Q → R .
U is the point on RP such that R → P = 4 R → U .
T is the midpoint of SP.
S R Q P T U b
(a) Express, as simply as possible, in terms of a and/or b:
(i) R → S ,
......................... [1]
(ii) R → P ,
......................... [1]
(iii) U → Q ,
......................... [2]
(iv) T → Q .
......................... [1]
(b) Write down two facts about the points T, U and Q.
1. ......................... 2. ......................... [2]
Paper 4
124.
(a) The magnitude of A → B is 10 units.
One of the entries of the vector is 8.
Point A is located North West of B.
Write A → B as a column vector.
A → B = ( ......................... ......................... ) [2]
Paper 4
127.
In the diagram, O → A = a , O → B = b , B → X = 1 4 B → A and B → Y = k a .
Vector diagram
(a) Express, as simply as possible, in terms of a, b and/or k:
(i) A → B ,
A → B = ......................... [1]
(ii) O → Y ,
O → Y = ......................... [1]
(iii) O → X .
O → X = ......................... [2]
(b) Given that OX is parallel to AY, find the value of k.
k = ......................... [3]
Paper 4
128.
In the diagram, O is the origin, O → A = a , O → B = b , and ON : NB = 1 : 2.
M is the midpoint of AB.
Vector diagram with midpoint
Express in terms of a and/or b, in its simplest form:
(a) A → B ,
A → B = ......................... [1]
(b) The position vector of M,
O → M = ......................... [2]
(c) M → N .
M → N = ......................... [3]
Paper 4
130.
In the diagram, O → A = a , O → B = b , B → Q = k b + a and O → P = 2 3 a + 1 3 b .
Vector diagram
(a) Express A → B in terms of a and/or b.
A → B = ......................... [1]
(b) A → Q in terms of k, a and/or b.
A → Q = ......................... [1]
(c) Find the ratio of AP to PB.
AP : PB = ......................... [3]
(d) Given that OP is parallel to BQ, find the value of k.
k = ......................... [3]
Paper 4
133.
In the diagram, O → R = 3 b , O → P = 4 a and R → S = 6 a .
Q lies on PR such that PQ : QR = 2 : 3.
Vector diagram
(a) Find the following in terms of a and b, giving each answer in its simplest form.
(i) P → R ,
P → R = ......................... [1]
(ii) O → Q .
O → Q = ......................... [2]
(b) Find O → S , in terms of a and b and hence show that O → Q = 2 5 O → S .
O → S = ......................... [3]
Paper 4