08 -29- 11
Agenda
 1) What is the “universal” language of
science?
Mathematics
TESTABLE
 2) The hypothesis must be ___________.
(hint: how can a scientist do an
experiment.)
1)
Warm-Up
2)
Safety Symbol Quiz (5 min)
3)
Physics Vocab. Words (10 min)
4)
Intro. to Linear Motion (10 min)
5)
Linear Motion Notes (10 min)
6)
Physics Board Notes (15 min)
7)
Formula Sheet
8)
Speed & Velocity WS (30 min)
(5 min)
Safety Quiz
NO TALKING!
•Notes/Handouts
•Quizzes
•Daily work
•Labs
•Misc.
1. Speed: measure of how fast something
is moving.
2. Average Speed: The average speed is
defined as the total distance traveled
divided by the total amount of time it
took.
3. Constant Speed: speed that does not
change
4. Elapsed time: time that has elapsed, or
passed, since the beginning of the
event.
Linear Motion
Kinematics
is the study of
how things move, but does
not address the question of
why they move.
The
study of why
things move is
called dynamics.
Therefore,
the
“general” term for the
study of motion
Kinematics + Dynamics
=MECHANICS
Understanding physics begins with motion or
the study of displacement.
A. Terms related to motion
-changing the position of a moving object in a
particular direction is called magnitude.
Displacement has vector (quantity) & direction &
so a vector quantity, represented by a straight
line segment from 1 point to another.
-Relative
motion is the displacement of
an object in relation to objects
considered stationary & can either be
motion in a straight line, or a curved
line (path). We will examine straight
line motion first.
TERMS RELATED TO MOTION
 Displacement:
change in position due to a
“difference” in start position and final position
 Distance
+ Direction = Velocity
 Displacement
is used with the term “velocity”
EXAMPLE
When
we describe something in
motion, we are comparing it to
something else.
Example:
A car is driving 45 miles per hour:
You only know it is moving because
the road and trees around it are
staying still.
So,
for motion to be found,
there must be something that
is stationary---called a
reference point
I.
–Speed (measure of how fast something moves)
define as the time rate of motion.
a.
If speed is constant, a straight line graph
will be found since at any randomly chosen
interval, the same value would be given.
Speed=distance/time
b. Average speed-divide total distance covered
by the elapsed time; does not include the
different speeds & variations taking place.
 When
you measure speed, it is based on the
“TOTAL” distance covered
 OR,
“how far” an object has traveled in a given
amount of time
“per”
So,
means “every”
45 miles per hour is saying
that something moves a distance
of 45 miles EVERY hour
(distance/time)
c. – Instantaneous speed—speed
at instant, can be determined
easily by a speedometer.
 Velocity
is a “vector” quantity, therefore it has
direction
 The
main difference between speed & velocity---velocity has direction and displacement
EXAMPLE
 Velocity has displacement (position) which means
that there is an “initial” point and a “final” point--df or di
Velocity
(speed in a given
direction)-a vector quantity since
velocity has magnitude &
direction; may be a positive or
negative value depending on the
direction object is moving.
A.
Average velocity- the total
displacement divided by the total
elapsed time.
B.
Constant velocity-constant speed
(motion at same speed) constant
direction (motion in a straight line)
C.
Changing or variable velocity-either
speed or direction changes.
DUE TODAY:
• Safety Quiz
• Vocab. Chart (KEEP)
• Formula Chart (KEEP)
“Less is only more where more is no good.”
Frank Lloyd Wright
DUE NEXT CLASS:
• Syllabus/Safety contract
• Binder/folders/CALCULATOR
• SPEED & VELOCITY WS I