1. Speed & Velocity

2. Speed Speed (s) – rate at which an object is moving
Does not depend on direction
speed = distance ÷ time (s = d/t)
Constant Speed – speed that does not change

3. Speed A car drives 100 meters in 5 seconds What is the car’s speed?
s = (100 m) / (5 s) = 20 m/s
100 m

4. Speed
A racecar is traveling at 85.0 m/s. How far does the car travel in 30.0 s?
What is the distance the car travels?
s = d/t → d = s × t
d = (85 m/s) × (30 s) = 2550 m

5. Speed
A rocket is traveling at 10 km/s. How long does it take the rocket to travel 30 km?
What is the time it takes the rocket to travel?
s = d/t → t = d/s
t = (30 km) / (10 km/s) = 3 s

6. Velocity Velocity (v) – speed with direction
velocity = displacement ÷ time
V = Δx /t

7. Example - + Distance traveled? 7 cm Displacement? Speed? +3 cm1 2 3 4 5 6 7 8 9 10 + -
5 s
3 s
4 s
1 s
2 s
Distance traveled?
Displacement?
Speed?
Velocity?
7 cm
+3 cm
(7 cm) / (5 s) = 1.4 cm/s
(+3 cm) / (5 s) = +0.6 cm/s