11-17-08


 * Graded DQ*
 * Friction Lab*

At the beginning of class Mr. Manning gave us a graded DQ. After he collected it, we went over it. The first picture describes the the normal force starting from the table going through the block and cylinder, and then the normal force going through the block. The gravitational force is drawing the the cylinder towards the table. There is also static friction force because of the fact that something in the environment is trying to slide against the object. The second picture has a normal force from the table up through the block and cylinder and it has a normal force going through the block. The cylinder and block exert a gravitational force to the table. Since the cylinder and block are at constant speed, then it exerts a kinetic friction force from the one side of the block going away from the object. Once that was done, Mr. Manning told us to read over the front page of the packet for the lab. Then he explained what we were suppose to do. once Mr. Manning was done explaining, we worked in groups of three on the Force of Friction--What a Drag!! Lab. The lab dealt with kinetic and static contact friction.




 * Test Friday and Reading Guide due Friday*