1-26-09

Cory Miller It was the first day back from mid terms and everyone was nurvous to hear what they recieved on the exam. I was not to happy with what i earned but oh well. We learned about what work and power is. From one molecule to another the energy is transferred by a process that is called work. Power is the rate at which work is done. Joules is another name given for work. Some questions that we worked on were like is it everyday work or scientific work if Jill works 20 hours a week? Or like is work being done when a crane lifts a car? I would have the answers for the questions but Mr. Manning did not tell us what the answers were. The fundemental units for work are newtons times meters and the units for power are work devided by time. The calculation for work is called a scalar product because when you multiply 2 vectors the answer will be a scalar. You can determine the work done on a system by calculation the bounded area on a Force-Desplacement graph. The area bounded by a Force vs. Time graph represents the impulse given to the system, while the area bounded by a Force vs. Displacement graph represents the work done on a system.