0201刚体定轴转动角动量定理及守恒定律02.pptx

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2.1.2 力矩和力矩做功;1 力过固定点的力矩 ;力矩 ;力F对O点的力矩;2 刚体定轴转动的力矩;刚体定轴转动中

只考虑沿转轴方向上的力矩 ;(2) 若有n个力作用在刚体上,且都在转动平面内,则合力矩为各力矩的代数和;; (3) 刚体内质点间的内力对转轴的合力矩为零, 即合内力矩为零。;3. 力矩的功;转动动能;动能定理;Application Moment of Inertia of a Bird’s Wing

When a bird flaps its wings, it rotates the wings up and down around the shoulder. A hummingbird has small wings with a small moment of inertia, so the bird can make its wings move rapidly (up to 70 beats per second). By contrast, the Andean condor (Vultur gryphus) has immense wings that are hard to move due to their large moment of inertia. Condors flap their wings at about one beat per second on takeoff, but at most times prefer to soar while holding their wings steady.;P48【例题2-7】正方形框架由ABEF构成,可绕通过O的轴转动 每边的质量为m, 长度l,框架绕O点的转动惯量为J;?方法一:假设正方形框架对转轴的转动惯量为J。框架转到下方时,EF边、FB边的力矩做的功为零,两条边竖直方

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