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Transcript 
Motion
When is
something in
motion?
Motion-
A change in
_________
Motion-
A change in
position
Person on chair
All motion is
relative
Reference point
The background or
object that is being used
for comparison
_____ is the most common
reference point
Earth is the most common
reference point
Speed
The rate at which an
object moves
Speed =
Distance
Time
D
S
T
Average Speed =
Total distance
total time
Example
A person ran 30 meters in 10
seconds. What is his speed?
Speed = Distance / Time
Speed = 30 meters / 10 seconds
Speed = 3 meters per second (m/s)
Time =
Distance
Speed
D
S
T
Example
A person ran at 3 m/s and ran 60
meters. How long did it take him?
Time = Distance / Speed
Time = 60 m / 3 m/s
Time = 20 seconds
Distance =
Speed x Time
D
S
T
Example
A person ran at 3 m/s and ran for
10 seconds. How far did he go?
Distance = Speed x Time
Distance = 3 m/s x 10 s
Distance = 30 meters
A little tougher
After 5 seconds someone is at 100 meters away,
and after 15 seconds he is now 120 meters away.
What was his average speed?
Total distance = 20 meters
Totally time is 10 seconds
Speed = 2 m/s
Units – Speed, Distance or
time?
Meters
Minutes
Meter/second
Miles
Inches
Miles/hour
Velocity is not Speed?
Velocity
Speed in a
given direction
Example – 120
m/s East
What is the total velocity?
Left Side – page 84
How can something be moving
and not moving at the same
time?
Explain a situation in which an
object has a difference in its
speed and velocity.
GAME TIME!!
Speed, Distance,
and Time!
D = 20 m
T=5s
S=?
S = D/T
Speed = 20 m / 5 s
Speed = 4 m/s
D
S
T
D = 100 mi
T = 2 hr
S=?
S = D/T
S = 100 miles / 2 hours
D
S = 50 miles/hour
S
T
D=?
T = 2 min
S = 70 mi/min
D=SxT
Distance =
2 min x 70 miles
min
D = 140 miles
D
S
T
D = 40 m T = ? S = 8 m/s
T = D/S
T = 40 m / 8 m/s
T = 5 seconds
D
S
T
Challenge!
Come up with a problem
using Distance, Time, and
Speed to fit the given
solution
S = D/T
Distance: ?
Time: ?
Speed: 20 m/s
T = D/S
Distance: ?
Time: 5 seconds
Speed: ?
D=SxT
Distance: 50 miles
Time: ?
Speed: ?
Work on ISN pages 86 And
87
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