Math/Physics
Cross product
Law of Cosines
Small angle approximations:
force to torque:
friction torque(viscous) >Wiki:
弹性力(k 为弹簧的劲度系数,x 为振子偏离平衡位置的位移):
阻尼力(c 为阻尼系数,v 为振子速度):
Potential energy
Springs:
Gravity:
Kinetic energy
Linear motion:
Angular motion:
Inertia
For cylinder: