S: Pinewood Derby
Speed and Velocity
March 6, 2008
Objectives1. Define distance, time, speed, and
velocity2. Calculate speed3. Distinguish between speed and
velocity4. Explain constant speed and average
speed5. Read a distance time graph
Motion is measured by time and distance
Distance
the separation of two positions
Distance
Commonly measured in meters kilometers
Time
the period between two events
Time
Commonly measured in Seconds Minutes Hours
Speed
the measure of how fast an object moves as it changes its position
Speed
Commonly measured in Meters per minute
(m/m) Kilometers per hour
(km/h)
Speed = Distance Time
25 2030 1535 10 5 0
SpeedSpeedSpeedSpeed
Time = 0 secondsmeters
SpeedSpeedSpeedSpeed
Time = 5 secondsmeters
25 2030 1535 10 5 0
SpeedSpeedSpeedSpeed
Time = 10 secondsmeters
25 2030 1535 10 5 0
SpeedSpeedSpeedSpeed
Time = 15 secondsmeters
25 2030 1535 10 5 0
Constant Speed
speed that does not change
Constant Speed
0
10
20
30
40
50
60
Time (seconds)
Dis
tan
ce (
mete
rs)
Average Speed
the total distance traveled divided by the total time of travel
Average Speed
0
5
10
15
20
25
30
5 10 15 20 25 30 35 40 45 50 55
Time (s)
Velo
cit
y (
m/
s)
Speed & Velocity Speed & Velocity Speed & Velocity Speed & Velocity
How is speed different from velocity?
Velocity
describes both the speed and its direction
90 km/h = speed
90 km/h west = velocity
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