1. Aim: How do we describe motion using the concepts of speed and velocity?

2. Do Now:
Calculate the distance. Calculate the displacement.

3. Average Speed and Average Velocity
Average speed is distance/time. Average velocity is displacement/time. v=d/t How must an object move so that its average speed and average velocity be equal?

4. Max the Motion of the Objects with the Correct Speeds
Speed of Light
Lockheed SR-71 Blackbird (Fastest Airplane)
NASA’s Juno Probe (Fastest Spacecraft)
Usain Bolt (Fastest Human)
Koenigsegg Agera RS (Fastest Street Legal Car)
77.16 m/s d) m/s
m/s e) 3 x 108 m/s
73, m/s

5. Problem 1 Batman walks 6 m left and then walks 3 m right in 3s.
Find the distance traveled.
Find Batman’s displacement.
Calculate Batman’s average speed.
Calculate Batman’s average velocity.

6. Problem 2 Hillary Clinton walks 18 m east and then 6 m west in 4s.
Find the distance Hillary traveled.
Find Hillary’s displacement.
Calculate her average speed.
Calculate her average velocity.

7. Problems 3 and 4
3. How far can a cyclist travel in 4s if his average speed is 11.5 m/s? 4. A runner’s initial position is 50.0 m and his final position is 30.5 m. This change in position occurs in 3s. Calculate the average velocity of the runner.

8. Problem 5
A car traveling 90 m/s is 100 m behind a truck traveling at 50 m/s. How long will it take the car to reach the truck?