Motion

The velocity of an object is the rate of change of its position. As a basis for understanding this concept:

a.	Students know position is defined in relation to some choice of a standard reference point and a set of reference directions.
b.	Students know that average speed is the total distance traveled divided by the total time elapsed and that the speed of an object along the path traveled can vary.
c.	Students know how to solve problems involving distance, time, and average speed.
d.	Students know the velocity of an object must be described by specifying both the direction and the speed of the object.
e.	Students know changes in velocity may be due to changes in speed, direction, or both.
f.	Students know how to interpret graphs of position versus time and graphs of speed versus time for motion in a single direction.