1
Phy 2053 Announcements
±
Homework 1 due Jan 21 is posted in
webassign. It will count towards course grade.
±
Optional solution manual: a limited number of
copies is available at the UF bookstore, at ~
$54. It contains solutions to some but not all
of the problems at the back of chapters; one
copy on reserve at the Marston Science
Library
±
Yellow book (past exams and solutions)
available at Target Copy for $16
±
Should have received email listing your clicker
response. Clicker questions will count towards
course grade starting Jan 27.
Vectors in one dimension: positive or negative, and magnitude
Vectors in two dimensions: direction and magnitude
Vectors
±
Equality of Two Vectors
Two vectors are
equal
if they
have the same magnitude
and
the same direction
A
v
B
v
C
v
D
v
B
A
v
v
=
C
A
v
v
≠
D
A
v
v
≠
Graphically Adding Vectors
±
When you add vectors, just put the tail
of one on the head on the next…
±
The resultant
is drawn from the
origin of the first vector to the end of
the last vector.
R
ur
The order in which the vectors are added
doesn’t affect the result
R
+
=+
ABBA
r
rrr
Commutative law of addition
Scalar Multiplication
²
The result of the multiplication or division of a vector by a
scalar is a vectorthe magnitude of the vector is multiplied or
divided by the scalar
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 Spring '06
 Buchler
 Physics, Acceleration, Work, Velocity, Atlanta, Dallas, Marston Science Library Yellow

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