PSC 1121 Lecture Notes - Lecture 13: Elastic Energy, Junkers J 1, Chemical Energy
Document Summary
Physical science energy (l13, l14,: energy, definition, kinds of energy, some applications in movies, conservation of energy. Energy: yet another way to view the motion or the possibility to move. It is hard to give a general definition of energy. Usually, we define energy by looking at special cases: such special cases are, kinetic energy, potential energy, due to gravity, due to elastic forces, chemical energy. For food, we use: 1 calorie = 4. 2 j, 1 calorie = 1000 = 4200 j. For atomic and nuclear weapons we use: 1 ton of tnt = 4. 2 x 10^9 j, 1 megaton of tnt = 4. 2 x 10^15 j, hiroshima bomb = 0. 012 megatons of tnt = 5 x 10^13. When an object moves we say that it has kinetic energy: e= m v^2. When an object does not move, but it has the tendency to move, we say that it has potential energy.
