太空授课实验很神奇 专家给你讲原理（Space experiment is magic, the experts tell you the principle）.doc

太空授课实验很神奇 专家给你讲原理（Space experiment is magic, the experts tell you the principle） The decryption Experiment one: quality measurement In the space, the ground measuring weight no longer work. Then, the astronauts want to know whether you are fat or thin? How to weigh? The teacher asked Wang Yaping. At Tiangong-1, a quality measuring instrument as a special . Space teaching assistant Nie Haisheng will own fixed at one end of the bracket, Wang Yaping will pull the movement mechanism of spring is connected to the specified location. Let go, pull the spring back to its original position. This is Nie Haisheng measured quality -- 74 kg. Secret: Newtons second law On this issue, Wang Yaping explained, in fact, is the second law of Newton F=ma. That is, objects by force = mass * acceleration. If you know the force and acceleration, which can calculate the quality, spring cam mechanism, produce constant force. That is, just back to the initial position of the assistant will force. In addition, also designed a grating measurement system, can detect body motion acceleration. Class teacher Luo Xinggao: grating speed measuring device measuring bracket reset speed V and time t, the calculated acceleration (a=v / T), we can calculate the mass of the object (m=F / a). Newtons second law is a universally applicable in all inertial space within the basic laws of physics, and do not change because of gravity environment, the velocity of the object, so in space and on the ground are established. Experiment two: simple pendulum movement T shaped bracket, a string tied to a ball. This is the common physics experiment device of simple pendulum. Wang Yaping will move up to a certain height from the ball, the ball like a magic wand, fixed on the position, motionless. Subsequently, Wang Yaping with a finger push the ball, the ball began around the axis support do circular motion. Secret: the weightlessness of space Zhejiang University of Aeronautics and Astronautics expert: on the ground, the