I have a project which is to create a mechanical device that would transfer close to 1 J of energy from one form to another and must be able to show how you calculated the 2 energy individualy and show that the enegy loss between the 2 is within a % difference. I posted on here yesterday asking help on calculated the Ep and Ek of a pendulum (which was my initial device idea). Now finding Ep of a pendulum was easy, the real problem came at finding the value of Ek after loss of energy due to air resistance. In order to find Ek we would have to find velocity. since we couldn't just go Ek=Ek and figure out the velocity that way because we have to take air resistance and loss of energy due in to consideration, there was really no other way of going about finding velocity at the bottom without some really scientific device. So that idea ended up being a fail. Now this project is suppose to be due tomorrow and I have yet to thought of another device that could transfer energy for one form to another and be able to calculate each energy individualy. If you guys van give me any suggestions for a simple device, I would be much appreciated. Thanks for the help!