Holt Physics Chapter 3—Two-dimensional Motion and Vectors
I.
Section 3-1—Introduction to Vectors
A.
Scalars and Vectors
1.
Magnitude and Direction
a.
In chapter 2 we discussed velocity.
Velocity
has both a magnitude and a direction.
b. Magnitude:
a measurement represented by a
number (e.g.
-12 meters/second)
c. Direction:
an indication of orientation.
For
velocities we use a positive number for right or
up and a negative number for left or down.
2.
Velocity is an example of a
VECTOR
.
Vectors
always have both a direction and a magnitude
a.
Vectors are differentiated from scalars in your
book by using
BOLD
type.
b.
Vectors are also represented by arrows.
The
longer the arrow the more magnitude the
vector has.
3.
Speed is an example of a
SCALAR
.
Scalars only
have a magnitude.
B.
Properties of vectors
1.
Vectors can be added graphically
a.
When adding vectors, you must make sure that
they have the same units and describe similar
quantities.
b.
The answer found by adding vectors together
is called the
resultant
.
(insert fig 3-2 here)
c.
Vectors can only be moved parallel
to
themselves in a diagram.
(see fig 3.3 on p.86)
II.
Section 3-2—Vector Operations
A.

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