02-02-09

Today in Physics Mr.Manning desided that he Was going to check 2 assinments from ast week for credit. He collected the sheet on top 10 mid term questions answered wrong, and checked the worksheet on work and power. Entertaining questions on the worksheet, MR. manning demonstrated how to do some of the work problems on the smart board. One student dident understand question 3a. How Much work is done by a power lifter on a 200 Kg barbell as it is being lifted to a height of 2.5 meters. He showed the answe onthe board w=4900Jand showed that the fource acting on the barbell was gravity and that that fource would be eguile to the upward fource. Manning goes on to review the rest of the problames on the worksheet and concludes with a segway into reveiwing a lab on work being done on ramps. On the lab we had to see how much fource, displacement, and work was being done on a cart while it was on a ramp. The angle of the ramp was the veriable in this lab.Your resultese and data you got from the car depended on the angle of the ramp. we filed out a chart that showed the fource, displacement,and work being done on the cart with the angles 15 degrease, 45 degrease, and 90 degreese. Mr.Manning made the point that We as students need to no the concepts of work and how to apply it to different problames, because to find enrgy you need to no how to find work.

With that he told us to start working on the hand on work and energy that we picked up at the begining of class. Some of these problames included 1) How much work(energy) is Needed to lift an object that weighs 200 N to a height of 4m? answer =800J because you mutiply weight and height. what is th power out put of an engine that does 60,000 J of work in 10 s. the answer was 6000watts because you devide you work by time. the whole period Manning elluded to a marvolise supprise. Well it tured out to be a graded Daily question on the concets just learned. two questions on work