1. Chapter 1: Motion

2. I. Reference Point
Starting point used to describe the position of an object (sometimes called the origin)

3. II. Speed
Speed is a change in position in a given period of time.
Speed = Distance / Time
Distance = Speed x Time
Time = Distance / Speed

4. III. Average speed
When the speed of a moving object is not always constant.
Average speed = total distance/total time

5. IV. Velocity
Speed in a given direction.
Velocity is a vector because it has both size and direction

6. C. The size of the vector shows the speed (faster is larger) and the directions are east, west, north or south.

7. D. The difference between velocity and speed is that speed has no direction, although often the two are used interchangeably.

8. The rate at which velocity changes with time. Speeding up.
V. Acceleration
The rate at which velocity changes with time.
Speeding up.
Slowing down.
Changing direction.