2-12-09

I walked into class this morning for the first time this week back to a regular day schedule. I proceeded past Mr. Manning's front desk and picked up a WS that is page 18 and also a half piece of paper. Since I knew that we did not have any due today, there must be a daily question. To my surprise and excitement, it was not only a daily question but it was a graded daily question. What else can start a day out with this type of excitement. The question was: When do we use the equations W= Change in EK and when do we use the equation W=EP. The correct answer for this question is we use the potential energy formula for when lifting an object off the ground at a constant rate. We use the kinetic energy formula for when we push an object across a horizontal floor. After explaining and handing in our daily question Mr. Manning reminded everyone about the speeding project due on Tuesday. We then moved onto the two labs that were due that day. The first lab was about a pill driver and a nail. Mr. Manning reviewed the questions and answers from that lab explaining how the force will be that same no matter what the height is of the weight being dropped. The force will remain constant due to the change in how far the nail will go into the board. After reviewing that lab we moved on to the cart lab. This lab explained the different between potential and kinetic engery and energy totals. After reviewing that lab we handed it in for grading. The bell rang and Mr. Manning wishes us all a great four day weekend.


 * Work Formula || When to Use It || Speed || Height ||
 * W= Change in Kinetic Energy || When moving across a horizontal floor || Non-constant || Constant ||
 * W= Change in Potential Energy || When lifting an object || Constant || Non-constant ||