You will be able to explain the relationship
between motion and a frame of reference
 You will be able to relate speed to distance
and time
 You will be able to distinguish between
speed and velocity
 You will be able to solve problems related
to time, distance, displacement, speed,
and velocity


Motion is an object’s change in
__________ relative to a reference point.

What are some examples of motion in
the world around you?

How do we know when an object is
moving?





Is more than just observing an object
You have to observe the object in relation
to a stationary object
This stationary object is called a reference
point or frame
___________ is a common reference point
When your objects changes position in
comparison to a reference point, then it is in
motion
Using the mountain as a reference point,
we can see that the balloon is in motion
 We can also give reference directions
such as north, south, east, west, up or
down
 How is the balloon moving?

Distance measures
 Displacement is the
the path taken by an
change of an
object
object’s position
 It doesn’t have to be  It must be in a straight
in a straight line or in
line and it must have
a specific direction
direction
 Example:
 Example:
› If I walk home from
› If I walk home form
school and then
school and then
come back I have
come back , my
covered a distance
displacement is
of 5 blocks in total
zero towards home

A tiger paces in her cage: first 8 ft. to
right, then 8 ft. to the left , and finally 8 ft.
back to the right
 What is the total distance the tiger has
traveled?


What is the displacement of the tiger?





You know from experience that some
objects move faster than others
Speed describes how fast an object moves
Speed measurements involve distance and
time
So speed is measured in units of meters per
second (m/s)
When an object covers equal distances in
equal amounts of time, it is moving at a
_________________
Speed can be studied with graphs and
equations
 It can also be determined from a distancetime graph
 Time is the ___________ variable and
distance is the ______________ variable

When speed is constant,
a straight line is formed
 Why?
 The slope of any distancetime graph gives the
_______ of the object
 An object at rest is a flat
line with a slope of
_________





Is describing the motion
of an object moving at
changing speeds
It is found by dividing
distance by time
speed = distance
time
r =d
t


Describes the speed of
an object at any given
point in time
Example: a car’s
speedometer
Describes both the speed and the
direction of motion
 It is found by dividing displacement by
time


v=d
t
velocity = displacement
time

Suppose a lion moves due east at
different speeds so that it travels 25 km in
4.0 hours. What is the lion’s average
speed? What is its average velocity?

What would the lion’s average velocity
be if it traveled 15 km due north in 2 hours
and 15 minutes?





When an object changes position in
comparison to a stationary reference point,
the object is in motion.
The average speed of an object is defined
as the distance the object travels divided
by the time of travel.
The distance-time graph of an object
moving at constant speed is a straight line.
The slope of the line is the object’s speed.
The velocity of an object consists of both its
speed and its direction of motion.