Introduction and Vectors
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t
#02
Ch 1 5
1 8
Lecture #02 – Ch. 1.5 – 1.8
Physics 125 – Fall 2010
Dr. Mike Melnichuk
[email protected]
Office: 2409 Randall Lab
Offi
H
2 00
4 00 / M
& T
i
R
1416 R
d ll L b
Office Hours: 2:00 – 4:00 / Mon. & Tue.
‐
in Rm. 1416 Randall Lab.
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Scalars and Vectors
SCALAR

quantity that can be described by a single number:
e.g. temperature, mass, money.
VECTOR

quantity having both magnitude
and direction
:
di
l
t
l
it
l
ti
f
t
e.g. displacement, velocity, acceleration, force, momentum.
• The magnitude
always has a positive
value – a number.
• The direction is specified mathematically by an angle which
• The direction
is specified mathematically by an angle
which
can be positive
or negative
– another number.