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Lesson 1.2 Geometric Vectors.notebook
1
February 05, 2016
Feb 32:51 PM Jan 209:07 AM
Lesson 1.2 Intro to Vectors
Lesson Goal:By the end of this lesson you should understand the concept of a vector and it's representation by direction and magnitude
Jan 209:09 AM
Definitionsscalar: a quantity that describes magnitude or size only (with or without units). It does not include direction.
ex: an airplane travelling at a speed of 900 km/h or a person that has a mass of 75 kg.
vector: a quantity that has both magnitude or size and direction.ex: an airplane has a velocity of 850 km/h west, the force of gravity
Jan 209:24 AM
Representing a VectorIn words: Ex. 5 km at an angle of 30o to the horizontalIn a diagram: a geometric vector, which is a representation of a vector using an arrow diagram, or directed line segment, that shows both magnitude (or size) and direction. The length of the arrow represents, and is proportional to, the vectors' magnitude.
A
B5 km
30o
Lesson 1.2 Geometric Vectors.notebook
2
February 05, 2016
Jan 209:37 AM
In symbols: using the endpoints of the arrow AB
Point A is the starting or initial point of the vector (also known as the "tail" of the vector).
Point B is the end or terminal point of the vector (also known as the "tip" of the vector).
In symbols: using the single letter: v
The magnitude, or size, of a vector is designated using the absolute value brackets. The magnitude of vector AB or v is written as:
AB
Jan 2010:08 AM
Directions of a VectorDirections of a vector can be expressed using a quadrant bearing. This is a measurement that is between 0o and 90o east or west of the northsouth line.A quadrant bearing always has three components: the direction it is measured from, the angle, and the direction toward which it is measured.
42o
77o
N
EW
S
N77E or 77o E of N
Feb 19:03 PM
162o295o
True bearing of a Vector (the goodest one)True bearings are expressed as threedigit numbers, including zeros. Thus, north is 000o, east is 090o, south is 180o, and west is 270o. N
EW
S
090°
180°
270°
000°
Feb 33:06 PM
Example:
Convert the following True Bearings into Quadrant Bearings or visa versa:
a) TB = 311o
b) QB = S12oE
Lesson 1.2 Geometric Vectors.notebook
3
February 05, 2016
Feb 33:13 PM Feb 19:14 PM
Characteristics of a Vector
Parallel Vectors have the same or opposite direction, but not necessarily the same magnitude.
Equivalent Vectors have the same magnitude and the same direction. The location of the vectors does not matter.
Opposite Vectors have the same magnitude but opposite direction. The location of the vectors does not matter. The following vectors are opposite:
and
Feb 19:23 PM
ExampleDraw a vector equivalent to AB, and label it EF
A
B
Write an expression of how are AB and EF related
Draw a vector opposite to AB, and label it GH
Write 4 expressions to show how AB and GH are related
.
A
B
Feb 51:15 PM
A B
C
D
EF
G
H
Lesson 1.2 Geometric Vectors.notebook
4
February 05, 2016
Feb 19:34 PM
Homework Sheet#1-10, 13 (#14 is a good assignment practice question)
Feb 27:52 PM