1. Motion
Speed: average and instantaneous
Velocity
Acceleration

2. Speed Average and Instantaneous

3. Let’s Go to Myrtle Beach

4. Average Speed
Average speed equals the distance traveled divided by the time of travel.

5. Instantaneous Speed

6. Scalars and Vectors
Many physical quantities are used in physics, which are divided into scalars and vectors.
A scalar quantity is one that can be described by a single number (including any units) giving its size or magnitude.
Examples: Time interval, distance, speed, volume, mass, temperature, and density.
A quantity that deals inherently with both magnitude and direction is called a vector quantity.
Examples: Force, weight, velocity, and displacement.

7. Scalars and Vectors Scalar Vector Distance Displacement Speed Velocity
Mass
Weight

8. Vector Illustration
Consider the following displacement vector of a car:
The length of the vector arrow is proportional to the magnitude of the vector and the arrow represents the direction.
In the text, bold face is used for vectors and italics is used for scalars. When hand written an arrow is placed above the symbol.

9. Velocity
Velocity is a vector.
Velocity = Speed + Direction

10. Acceleration
Have you experienced acceleration?

11. Acceleration
Acceleration is the rate at which velocity changes.

12. Acceleration

13. Positive Acceleration

14. Negative Acceleration

15. Can a Car Be Accelerating When Its Speed Is Constant?

16. Acceleration of a Sports Car

17. Free Fall
Acceleration due to gravity affects the velocity of an object as it falls.