dreamkl 发表于 25-7-2013 01:54 PM
你班奈很多,有注意到。。。但是我很懒写,没美女看。。。哈哈
关键字眼叫 rotation inertia ,所以 s ...
我看到這些東東,直接暈去。
The force of gravity on the mass of a simple pendulum generates a torque around the axis perpendicular to the plane of the pendulum movement. Associated with this torque is an angular acceleration of the string and mass around this axis. Let be the component of force in the direction of the acceleration of the pendulum mass and the length of the string, so the acceleration of the mass is , then , becomes, where is a unit vector perpendicular to the plane of the pendulum. The quantity I = mr2 is the moment of inertia of this single mass around the pivot point. The quantity I = mr2 also appears in the angular momentum of a simple pendulum, which is calculated from the velocity v = rω of the pendulum mass around the pivot. This is given by Similarly, the kinetic energy of the pendulum mass is defined by the velocity of the pendulum around the pivot to yield
我沒進修過Fizik。
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