speed and velocity2008
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S: Pinewood Derby
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Speed and Velocity
March 6, 2008
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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
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Motion is measured by time and distance
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Distance
the separation of two positions
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Distance
Commonly measured in meters kilometers
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Time
the period between two events
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Time
Commonly measured in Seconds Minutes Hours
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Speed
the measure of how fast an object moves as it changes its position
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Speed
Commonly measured in Meters per minute
(m/m) Kilometers per hour
(km/h)
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Speed = Distance Time
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25 2030 1535 10 5 0
SpeedSpeedSpeedSpeed
Time = 0 secondsmeters
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SpeedSpeedSpeedSpeed
Time = 5 secondsmeters
25 2030 1535 10 5 0
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SpeedSpeedSpeedSpeed
Time = 10 secondsmeters
25 2030 1535 10 5 0
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SpeedSpeedSpeedSpeed
Time = 15 secondsmeters
25 2030 1535 10 5 0
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Constant Speed
speed that does not change
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Constant Speed
0
10
20
30
40
50
60
Time (seconds)
Dis
tan
ce (
mete
rs)
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Average Speed
the total distance traveled divided by the total time of travel
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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)
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Speed & Velocity Speed & Velocity Speed & Velocity Speed & Velocity
How is speed different from velocity?
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Velocity
describes both the speed and its direction
90 km/h = speed
90 km/h west = velocity