One end of the rotation axle is connected with an electromagnet by a pull rod and a weightrod.
转动轴的一端通过拉杆和重锤杆与电磁铁相连。
2
Because in the linear portion of the curve where Hooke's Law holds, I could hang a weight on the rope... or on the rod and I could let it oscillate vertically.
在曲线的胡克定律，所适用的线性区域内，在绳子上挂一重物。，或者挂在棒子上，然后让它垂直振荡。
3
If you let a baby grasp a rod and try to pull it away, he will cling more and more tightly until his whole weight is suspended.