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Physical Knowledge In Trampoline
- Apr 13, 2018 -

Trampoline is a competitive sport that athletes use the trampoline to show acrobatic skills. It belongs to gymnastics and is called "air ballet".    

Trampoline contains a lot of physical knowledge, looking for the power in trampoline. Here we select a process analysis:

We decomposed the athletes from high altitude from static to several stages.

First, the athletes fell from the high to the trampoline. In this process, the center of gravity of athletes decreases, gravity performs positive work, and gravity potential energy decreases, and the kinetic energy increases.    

Two, athletes from contact trampoline to its speed increased to the maximum. At this stage, the center of gravity of athletes continues to decrease, and the potential energy of gravity continues to decrease. The increase of kinetic energy increases the speed of athletes. Why will the speed of the athletes increase? Because trampoline is related to the elastic force of athletes and the deformation of trampoline. The larger the deformation, the greater the elasticity. When contact trampoline, the deformation is smaller, the elastic force is smaller, less than the gravity of the athlete, the direction of the resultant force is downward, the same as the direction of motion, so the speed continues to increase; when the force is equal to gravity, the force is zero, and the speed of the human is no longer increasing, reaching the maximum value. At the same time, the shape variables of spring have been increasing and the elastic potential energy has been increasing. In this process, the gravitational potential energy is transformed into kinetic energy and elastic potential energy.    

Three, athletes from speed to exercise to the lowest point. At this stage, the center of gravity of athletes continues to decrease, and the potential energy of gravity continues to decrease. Why will the speed of the athletes decrease? Because at this time the elastic force of the athlete is already larger than the gravity, the resultant force is upward, and the direction is opposite to the direction of motion, so the speed decreases gradually until the velocity is reduced to zero. When the person reaches the lowest point, the trampoline has the largest variable and the elastic potential energy is the largest. In this stage, gravitational potential energy and kinetic energy are transformed into elastic potential energy. In the whole process, the system energy conservation is composed of man and spring, and the lowest elastic potential energy is equal to the decrease of the whole human gravitational potential energy.  

Four, the athletes rise from the lowest point to the highest point. This process is opposite to the decline process, and is accompanied by the mutual transformation between the elastic potential energy and the gravitational potential energy, kinetic energy and other energy. But in trampoline competition you will find such a scenario: after take-off will be more jumped higher. How did he do it?    

The attentive audience will find the movement of the knee in the process of falling, the purpose of which is to further reduce the center of gravity and convert more gravitational potential energy into elastic potential energy; when the minimum point of trampoline rises, the athletes will stand on the body and push the trampoline to the kinetic energy and the gravitational potential energy. In this way, during the rising process, besides the elastic potential energy, a part of chemical energy can be transformed into kinetic energy and gravitational potential energy, so that athletes can get higher.