Ballpendulumtest王鑫宇.docVIP

Ball pendulum test I translate it in Chinese, I have put the original text at the back 5-ball spherical pendulum: pull up the ball at a certain degree ,and release this ball ,let I hit the second ball which stays motionless at 90 degree ,the fifth ball which stay right behind the forth one ,will pull up at particular degree of the first . as while the first ball will stay motionless instead at 90 degree. Pull up two balls,let they break to the other balls we can see there are also two balls up in the other side. Pull up two balls on both side at the same time and let go. Can see two group of the ball are moving in the same harmonic movement. Experiment principle: From the momentum conservation and energy conservation principle, if two quality such as elastic ball is touch, they will exchange the speed. This belongs to one of the head-on collision, head-on collision can be simplified made of the two properties： 1. Collision short time, the interaction is strong, dont consider outside influences; 2. Before and after collision state changes suddenly, sharp and can think: speed changes, but the position does not produce change. Momentum conservation : Energy conservation: If m1 = m2 can draw two at the end of the ball speed equal. The two speed that momentum conservation in opposite directions. So will appear experiment phenomenon. If the ball is not steel ball, but similar mouse wheel rubber ball, still follow momentum conservation, but because of the loss of the collision and mechanical energy is obviously, so no matter what kind of experiment, because of the collision of the pop-up height will much lower than the last. 3-no same qualities ball: Pull up the small ball at a certain degree, Can see the biggest ball only for a small range vibration. At that time, the small ball is moving between the initial position and the middle of the equipment. As if the small ball is backing into a wall. And the period of two ball is the same. Pull up the big ball at a certain