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Word Count: 555
When an object with mass is moving that it has kinetic energy is well known Energy quantity can be expressed in two parameters of the mass and the speed Generally definition of energy is difficult though the quantity can be measured easily Assume that ball A like billiards with mass M at speed of V collides with center of other standstill ball B as the same peculiarity as ball A I express that ball A has Energy of Motion be in proportion to MV Before collision there has zero energy with ball B we dont consider like rest energy and disregard small loss energy like heat and influence of its rotation in this chapter After collision ball A becomes to be at rest and ball B is moving at velocity of V It can consider that the energy of motion with ball A transfer to ball B Energy is movable like this The whole of energy is the same as before and after This is an instance which most basic and important of being called law of energy conservation It is hard to measure energy when pushing a wall being at rest by stick but we can know the energy quantity by pushing a ball with the same force Doing like this even if directly operated energy quantity is unknown the energy can be known by measuring the speed of the object which energy is added to Complex operated energy is convertible into simple case Incidentally we have been using quantity of velocity with no particular consciousness unexpectedly it could not be easy to understand Velocity is considered as relative quantity in physics If we suppose so energy which is function of the velocity would be also relative quantity By these thought we will be confronted with a difficult problem right now Suppose that look at a station from moving train at speed of V the station universe is moving to contrary direction at V
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