Julius Sumner Miller Lesson 5 Energy and Momentum

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=4lC2bzXZq7I

It is of great importance that the ideas of ENERGY and MOMENTUM be clearly • distinguished and understood. Mathematically, momentum is M x V or MV. • Energy - more exactly kinetic energy - is 1/2 MV^. We need not worry here • where the 1/2 comes from. Momentum is the consequence of a force acting for • a time: F x t. Energy is the consequence of a force acting over a distance: ___ • Thus it is with the two cars: • The force acting on both cars is the same. The force acts for the same time on both. The force acts for a greater distance on the little car and for a lesser distance on the bigger car. • Accordingly: The F x t is the same for both. • Therefore their momenta are equal. The F x S for the little car is greater than the F x s for the bigger car. Therefore their energies are UNequal. • We show an array of DEMONSTRATIONS bearing on ENERGY and MOMENTUM. • 1 - On a curved track the ball can go no higher to a remote end than the height • from which it was released. • 2 - We drive a nail into a block of wood. The energy delivered to the system • by the moving hammer is spent in splitting the wood and raising the temperature of the nail and the wood. Friction always produces heat. • 3 - We demonstrate acoustic energy which arises from the mechanical energy • of my moving vocal cords. • 4 - Thermal energy communicated to a kernel ,of corn makes it pop . The • expansion of the water in the corn is enormous. • 5 - We rub a rod of bakelite (hard-rubber) with a piece of fur. This mechanical • work separates the electric charges and creates electrostatic energy. • 6 - A pile-driver delivers the potential energy of the driver to the nail. • 7 - A spring is compressed; potential energy is stored. This energy can push • a ball upward when the spring recovers . • 8 - In shooting a gun we hold it tightly against the shoulder so the kick • less. • 9 - A child's toy stores elastic energy in a wound-up rubber band. This • stored energy can drive the car backwards. • 10 - A geared-wheel is turned by mechanical force. The energy thus stored can heat a metal to incandescence - that is - hot enough to emit light, Thus mechanical energy produces heat and light. • We show a likeness of Christiaan Huygens, a Dutchman, who contributed to our understanding of these things.","styleRuns":[{"startIndex":0,"length":2311,"styleRunExtensions":{"styleRunColorMapExtension":{"colorMap":[{"key":"USER_INTERFACE_THEME_DARK","value":4294967295},{"key":"USER_INTERFACE_THEME_LIGHT","value":4279440147}]}},"fontFamilyName":"Roboto"}]},"headerRuns":[{"startIndex":0,"length":2311,"headerMapping":"ATTRIBUTED_STRING_HEADER_MAPPING_UNSPECIFIED"}]}},{"itemSectionRenderer":{"contents":[{"messageRenderer":{"text":{"runs":[{"text":"Comments are turned off. 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