Momentum and its conservation during collisions is introduced. Kinetic energy can decrease or increase during collisions. When kinetic energy is conserved, we call it an elastic collision. The momentum vector, internal forces, external forces and the conservation of momentum are discussed. Professor Lewin does some air track experiments where the released energy is from a compressed spring; kinetic energy increases but momentum is conserved. The definition of the center of mass is described. The center of mass behaves as if all the matter were together at that point.
This course is a first-semester freshman physics class in Newtonian Mechanics, Fluid Mechanics, and Kinetic Gas Theory. In addition to the basic concepts a variety of interesting topics are covered in this course: Binary Stars, Neutron Stars, Black Holes, Resonance Phenomena, Musical Instruments, Stellar Collapse, Supernovae, Astronomical observations from very high flying balloons (lecture 35), and you will be allowed a peek into the intriguing Quantum World.
The Massachusetts Institute of Technology (MIT), founded in 1861, is located in Cambridge, Massachusetts, and is one of the foremost U.S. institutions in science and technology. It is comprised of five schools and one college, including the renowned School of Engineering and Sloan School of Management, offering Bachelor's, Master's, and Doctorate degrees. Notable alumni include Ben Bernanke, Chairman of the Federal Reserve, Benjamin Netanyahu, prime minister of Israel, and American astronaut "Buzz" Aldrin.