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# Motion

Unit introducing motion, position, displacement, distance, speed, velocity, acceleration, and basic graphing.
by

## Shaun Cooper

on 22 May 2013

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#### Transcript of Motion

M
O
T
I
O
N
EVERYTHING MOVES!!
2. All
matter
in the universe is constantly in
motion.
2.1. Example:
The Earth is always revolving around the Sun.
What are some other examples of matter in motion?
DESCRIBING MOTION
3. To describe an object in motion, we must
first recognize that the object is in motion.
How can we describe motion? How do we know an object is moving?
DESCRIBING MOTION (cont.)
4.1. Motion - an object is in motion of its
position
changes
relative
to another object
4.2. Position - an object's
location in space
4.3. Reference point - a place or object used for
comparison
to determine if something is in
motion
To determine if something is in motion:
5.1.
What is the reference point?
5.2.
Did its position change in relation to the reference point?
DISTANCE and DISPLACEMENT
6.1.
Distance
- interval of space between two objects measured along the actual path taken between them
6.2. Displacement - interval of space between two objects measured
along the shortest path connecting them
7.
Distance
is described in terms of
magnitude
and
displacement
is described in terms of
magnitude

and

direction.
DISTANCE and DISPLACEMENT (Examples)
SPEED
11. To further describe
motion,
we generally want to describe
how fast something is moving.
13. The faster something is moving, the greater the distance it can travel in a unit of time.
Example: What does 55 mph stand for?
14.
Speed (in meters/second) = distance (in meters) / time (in seconds)
12.1.

Speed
- the distance an object travels in a unit of time
SPEED (Practice Problems)
Speed
(in meters/second) =

distance
(in meters) /
time
(in seconds)
TYPES OF SPEED
19.1.

Average speed - found by dividing the
total distance
traveled by
total time taken
19.2.
Instantaneous speed
- the speed of an object at one instant of time
Point to Ponder:
18. When traveling, do we always go the same speed?
Average Speed =
Total Distance / Total Time
VELOCITY
22.1. Velocity - the speed of the object and the
direction
of its motion
The motion of an object also depends on the direction in which the object is moving.

23. The velocity of an object can change if the object's
speed
changes, its
direction
of motion changes, or they
both
change.
ACCELERATION
25.1.

Acceleration
- the change in velocity divided by the time it takes for the change to occur- measured in m/s^2 (meters per second squared)
24.
Speed
is described in terms of
magnitude
and
velocity
is described in terms of
magnitude
and
direction.
Acceleration can change in three ways:

26.1.

Speeding Up

- Acceleration changes in the direction the object is moving.
26.2.
Slowing Down

- Acceleration is changing in the opposite direction the object is moving.
26.3.
Changing Direction
- The object moves on a curved path, and the acceleration is in the direction of the turn.
15. Calculate the speed of a swimmer who swims 100 m in 56 s.
16. What is the speed of an object that travels 360 m in 20 s?
17. John travels 75 m in 15 s. What is his speed?
20. A car travels between 2 towns 60 miles apart in 2 hours. What was the average speed?
21. You travel to a city 200 km away in 2.5 hours. What is your average speed in km/h?
10. What is your
displacement
if you walk 100 m north, 20 m east, 30 m south, 50 m west, and then 70 m south?
Speed:
55 km/h
Velocity:
55 km/h West
SOME HISTORY FOR YOU
27.
Galileo Galilei
is a historic mathematician, scientist, and inventor who made great strides in astronomy, math, and physics. Galileo was born in 1564 and died in 1642 at the age of 77 years old. He lived in
Tuscany,

Italy.
It is rumored that Galileo dropped two balls of different masses off of the
Leaning Tower of Pisa
and that they both hit the ground at the same time; however, there is very little evidence to support this.

28. However, we do know that he performed an experiment with an inclined plane and wire, thus discovering that the
acceleration of gravity
on EVERY object is 9.8 m/s^2.
1. Dr. Harold Edgerton:
The Man Who Made Time Stand Still
(1903-1990)
Noted scientist and an
artist
because of his work with
motion
and strobe photography.
A LITTLE JINGLE FOR YOU
8.
Odometers
NW
9.
Write this off to the side of your paper!!
Full transcript