3-11


 * Thursday, March 11 2009**

Today we had a short class because of the early dismissal.

What we did:

First, Joey and Mr. Manning demonstrated Question 4 on the Centripetal Forces Lab: Swingin' Nephews. __**Question 4**__: Will the centripetal force (tension in arms) increase, decrease or remain the same as you change nephews in order of increasing mass while keeping the radius and the speed the same for each.

Joey and Mr. Manning spun the mass of the nephew until the tagental speed of both Joey's and Mr. Manning's were the same. Mr. Manning had the longer radius. The results were: Mr. Manning- 2.60N/.0521kg Joey- 1.00N/.0205kg

After this, we finished working on our graphs and printed them.

Then, we went over the lab and disscussed it as a class.

Some of the things we talked about were:

Quadratic graphs- y=x^2 If the points on the graph get squared, it becomes more of a straight line. F~V^2 meaning force is proportional to velocity squared.

We ran out of time at the end of the class period and are going to talk and work on it more tomorrow.

Here is a graphic of what Joey and Mr. Manning did:

__**Homework: Finish page 8 of the lab**__