Anyways, then we talked more about graphical vector constructions. Our goal was to be able to construct an acceleration vector at any point on the graph. The first thing we did was find the scale. Then, we found the change in position from one point to the next, and divided that by the change in time to get the change in velocity for that vector. Then, we repeated that with the next two points to find that velocity. We used those two velocities to find the acceleration at the point in the middle of the 3 points we used. To find the average velocity, we made a point in the middle of the first and second points given and drew a vector through the second point that was as long as the velocity we found earlier. We did the same for the next 2 points. Then, we connected the two vectors and made a resultant vector. This resultant vector is the velocity it takes to turn in a different direction and is also the direction of the acceleration. This kind of change in velocity is called centripetal. When the only thing that changes in velocity is speed it's called tangential. In the second period of today's double physics we did a lab that had to do with ramps and frictional force on blocks. We set the ramp at a 15 degree angle and calculated the frictional force by making a graphical vector.
That's all we did today during physics. Tomorrow's scribe is Gaston!
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