**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?

Answer: _______________________________

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!!