Friday, September 17, 2010

AP Labs

1) Falling mass lab.
Its formal
Note that you cannot find the value of the last two columns for the first row because you do not know what v zero was ( it was already moving by the zeroth dot.)
Plot the cumulative distance (when I said plot the displacement , I meant the displacement from the origin which is the same as the position).

2) Vector lab. Section 5 due Tuesday, Section 4 due Wednesday

I did not show Section 5 how to move a vector from the origin to the head of another vector while maintaining its direction, so I'll try to explain it here. Let's say you want to add vector A to vector B. Thus you want to draw a line that is parallel to vector A, which starts at the head of vector B and is just as long as vector A. Take two rulers or other objects that have straight sides and ends at right angles between their sides and bottoms. Place the first ruler so its edge lines up on the vector you want to move, let's call it vector B. Place the second ruler so its edge lines up with and fits snugly against the bottom of the first ruler. Hold ruler two firmly so it doesn't change orientation. Now slide the first ruler keeping its bottom tightly against the second ruler's edge until the edge of the first ruler lines up with the head of vector B. Use this edge to draw a line which will be parallel to the original vector A. The new vector A will be on this line starting at the head of vector B and equal in length to the original vector A.

Every lab needs a purpose and a conclusion. The vector lab should have these plus two diagrams ( B+A and A+B+C), and answers to the questions directly on your lab sheet.

All labs should have your name, date the lab work was completed ( today in this case) and the lab partners at the top, even if the lab sheet doesn't have a space for these things.

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