1. Introduction to One-Dimensional Motion

2. Key Terms Scalar Quantity Vector Quantity Distance Displacement Speed
Take a minute and give your definition of the these key terms.
Scalar Quantity
Vector Quantity
Distance
Displacement
Speed
Velocity
Acceleration

3. Quantities associated with motion
Scalar Quantities do not have direction. Scalar quantities only have magnitude (how much)
Ex: 15 meters, 28 km/s
Vector Quantities have both magnitude and direction.
Ex: 15 meters to the right, 28 km/s to the North

4. What’s the difference between distance and displacement?
Distance: the total magnitude traveled
For example, if you have to take the long way around a traffic jam, your distance increases
Displacement: the shortest distance from the starting point to the ending point

5. The differences between distance and displacement
The differences between distance and displacement can be summarized as:
Distance Displacement
Depends on the path Independent of path taken
Always positive Can be positive or negative
Is a scalar Is a vector

6. What is average speed?

7. What is Average Velocity?

8. Speed & Velocity Examples
Speed is distance divided by time
2 cm/s
Velocity includes the direction
2 cm/s west
West

9. The differences between speed and velocity can be summarized as:
Depends on the path taken
Always positive (+)
Is a scalar
No dependence on direction and so is only positive
Velocity
Independent of path taken
Can be positive (+) or negative (-)
Is a vector
Direction can be guessed from the sign (i.e., positive or negative)

10. What is the difference between average velocity and instantaneous velocity?
Average Velocity: Total Displacement divided by total time
Instantaneous Velocity: Velocity at a certain moment
Ex: A school bus takes 45 minutes to travel 25 miles. What is the average velocity?
What is the instantaneous velocity when it stops?

11. Using Graphs to Calculate Speed