A#40 Vectors Day 6 Paper #1 Review.

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A#40 Vectors Day 6 Paper #1 Review

A#40 day 6 Vectors paper1

N2008/SP1/TZ0

V e c t o r s N2008/SP1/TZ0 (i) AO +OB = – a + b = b – a Recall: OB = b OA = a AO = -a (ii) speed = Recall: Speed is the magnitude of the velocity vector. Particle motion

V e c t o r s N2008/SP1/TZ0 (b) Equation of line L: or Particle motion

2008/SP1/TZ2 Section B Consider the points A(1, 5, 4), B(3, 1, 2) and D(3, k, 2) with (AD) perpendicular to (AB).

Perpendicular vectors: Scalar product is 0 2008/SP1/TZ2 Section B (i) AB = AO +OB = – a + b = b – a (ii) AD = AO +OD = – a + d = d – a Perpendicular vectors: Scalar product is 0

Perpendicular vectors: Scalar product is 0 2008/SP1/TZ2 Section B (b) 4 – 4(k – 5) + 4 = 0 4k + 28 = 0 k = 7 (c) Recall: a | b => Scalar product = 0 Perpendicular vectors: Scalar product is 0

Method 2: The scalar product of | vectors is 0 2008/SP1/TZ2 Section B V e c t o r s (c) (cont) OC = OB +BC = b + BC (d) Given AD | AB, since BC = (½)AD, BC has the same direction as AD. So BC | AB and ABC = 90o. cos ABC = cos 90o = 0. ^ A D C B ^ Method 2: The scalar product of | vectors is 0

2010/SP1/TZ2 2010/SP1/TZ2

The unit vector has magnitude of 1 2010/SP1/TZ2 V e c t o r s BC = BA +AC = AC – AB (b) Length (magnitude) of AB = Unit vector is: The unit vector has magnitude of 1

The scalar product of | vectors is 0 2010/SP1/TZ2 (c) => AB | AC. Alternately, cos  = 0 Vectors perpendicular AB | AC The scalar product of | vectors is 0

N09/5/MATME/SP1/ENG/TZ0/ N09/5/MATME/SP1/ENG/TZ0/

N09/5/MATME/SP1/ENG/TZ0/ N09/5/MATME/SP1/ENG/TZ0/

2010/SP1/TZ1/Section B

Parallel vectors are scalar multiples of one another 2010/SP1/TZ1/Section B (a) Equations of parallel lines: Parallel vectors are scalar multiples of one another

The scalar product of | vectors is 0 2010/SP1/TZ1/Section B (b) Equations of perpendicular lines: (2)(-7) + (1)(-2) + (-8)(k) = –14 – 2 – 8k = 0 – 16 – 8k = 0 k = – 2 The scalar product of | vectors is 0

V e c t o r s 2010/SP1/TZ1/Section B (c) L1 and L3 intersect at A. Set L1 = L3. Solve. (-3) + p(2) = (5) + q(-7) (-1) + p(1) = (0) + q(-2) p + 2q = 1 (-25) + p(-8) = (3) + q(-2) - (-8p + 2q) = -(28) 9p = -27 => p = -3 q = 2 Point A is (-9, -4, -1) Intersecting lines

Position vectors OA and OB. 2010/SP1/TZ1/Section B V e c t o r s (d) (i) AO +OB = – a + b = b – a Recall: OB = b OA = a AO = -a Position vectors OA and OB.

2010/SP1/TZ1/Section B V e c t o r s (d) (ii) AC = AB +BC (ii) magnitude = Particle motion