Class 9-4-09

Friday, in class, we talked about the difference in position, distance, and displacement. Position is the distance and direction from the origin. Distance is the length with no direction. Displacement is X final - X initial. There is never a negative displacement. We also talked about the photo finish lab. The buggy and the cart on the incline travel the same change in distance in the same amount of time. We discovered that our graph for the cart on the incline was a parabola. We used GeoGegbra to determine that is was a parabola. We also learned that over a very small amount of time, the velocity is nearly constant. Instantaneous velocity has 3 steps:
1. small time interval
2. time interval must be small enough so that it looks like constant velocity
3. find the average velocity of the very small change in time and you have instantaneous velocity.
We ended the double period in the computer lab working on our lab.
Anna is the next blogger.