1. Collect Homework.
2. Distance problem
At 60 mph, it takes 60 seconds to travel a mile.
At 120 mph, it takes 30 seconds to travel a mile.
At what speed would it take 45 seconds to travel a mile?
Ans.: 80 mph!
3. Difference between Displacement and Total Distance.
Displacement is just the difference between the coordinate of the final point and the coordinate of the initial point.
For example, a person walks along the number line and begins at the point whose coordinate is zero. That person walks 5 units to the right, then turns around and walks to the left 8 units. What is the displacement and the total distance?
Examine the diagram below. The displacement is -3 because the person wound up 3 units to the left of the starting point. However, the total distance traveled is 13 units (5 units + 8 units).
4. Example
5. Example
6. Additional Examples:
7. Song about Velocity, Acceleration, Distance, and Displacement