Lab 7: Modeling Friction Forces, lab partner: Jamie Lopez, Date: 09-23-16

2) In this experiment, we are going to derive different experiments that include friction.

3) There are five experiments we are going to work on. They are static friction, kinetic friction, static friction from a sloped surface, kinetic friction from sliding a block down an incline, and predicting the acceleration of a two massed system. We want to calculate the coefficient of static and kinetic friction by using the logger pro devices and using the formulas of what we learned so far.

4) In the static friction experiment, we used a smooth long board attached to a pully. We put a block on top of the board and a mass unknown amount hanging. Once the block moves forward we determined our static friction. For kinetic friction, we attached a string to a device to detect the Newton measurement as the object is pulled forward. Next, we elevated the board and determine its angle and find when the block slides as the slope increases for the static friction. Then, we determined the kinetic friction as it slides down the board and find the coefficient. Lastly, we predict the acceleration of a two mass system.

5)

7) In the first page, we wrote down the data of the mass we calculated in our experiment. We solved to find the coefficient for static friction and the kinetic friction according to the equation. On the next page, we did the same procedure but analyzed to see if the coefficient of static and kinetic friction would be any different if the object moving was on an elevated surface. The last page we conducted an experiment to find the acceleration of the 2 masses on a pulley. We solved for the acceleration according to the equation on the page and used the logger pro device to see if our calculations were accurate. Our calculations were off by 0.09 meters per second squared which is not that far off.

8) According to our calculations, our results came out pretty accurate. We followed the equations of Newton's Laws of Forces and repeated our experiment to make sure we would get the same results more than once. The hardest part in the experiment was finding the static coefficient of friction because once we deducted a small amount of mass the instant the object moved, our uncertainty was off by 5 grams of mass.