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本文所介绍的演示教具,是把做匀速圆周运动质点的角动量的大小和方向与原点的选取联系起来,并形象地展现了角动量在空间的转动景象.如图1所示的作匀速圆周运动的质点m,对转轴上O点的角动量为:
The demonstration teaching aids introduced in this paper relate the size and direction of the angular momentum of a uniform circular motion particle to the selection of the origin, and graphically show the rotation of the angular momentum in space. The uniform velocity circle is shown in Figure 1. The mass point of motion m, the angular momentum at point O on the axis of rotation is: