9/23/2008
1
1
Vectors
2D motion
2
VECTORS have
magnitude
plus
direction
Three ways of representation
1. Graphically as arrow
2. As letter capped by arrow
A
3. As
boldface
letter
A
3
VECTORS
Vectors are equal
ONLY
if they have
the same
magnitude and
direction (and
represent the
same quantity).
It does not matter
that they are
drawn at different
places.
4
To
ADD
vectors use
tiptotail method:
A
A
B
A+B
B
VECTORS
5
A
B
To
SUBTRACT
a vector add its negative:
A

B = A + (B)
B
B
A
B
A

B
VECTORS
6
Multiplying a vector by a scalar number
A
2
A

0.5
A
VECTORS
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