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Jay Frederick

Today we had a sub who told boring but interesting jokes to start the class off. Also we were grateful to have one of my dearest friends also tell a joke. After that we watched a video on work & energy and how the two are related. During the video, i realized that energy is always conserved and by energy always satying the same, thats what people mean by saying the conservation of energy. Height and Speed may change if caused by work and to calculate the amount of work done on a lifted object; you use this equation: W=F*H. But when calculating potential energy, you must use the euqation: UW=mgh. Work that is done on a object and the potential energy it receives is the same amount.

Even though energy is always conserved, it can convert from 1 form of ernergy to another like when a object's energy stops moving and is made into heat. The reason why there isnt enough energy at hand if the total energy in the universe is always the same amount, is by a "less useful form meaning" that we can not use anymore. When people use the term Mechanical Energy, they mean potential or kinectic energy. To find out the mechnical energy of a system, you just add these two energys together. Also thermal energy is just another name for energy of heat.