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第三章 运动的守恒定律 PowerPoint PPT Presentation


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第三章 运动的守恒定律. 研究对象: 质点系统 ;系统的过程问题,确立和认识运动的 守恒定律:能量守恒、动量守恒、角动量守恒. 重力. 保守力. 弹性力. 万有引力. §3-1 保守力 成对力作功 势能. 1 、 保守力 ( conservative force ) 功的大小只与物体的 始末位置 有关,而与所经历的路径无关,这类力叫 保守力 。. 非保守力:作功与物体运动路径有关的力,如摩擦力、爆炸力。. 保守力沿闭合路径一周所做的功为零 。这一结论也可以作为保守力的定义,它和保守力的功与路径无关的定义是完全等价的。. f 2. f 1 = -f 2. 1.

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第三章 运动的守恒定律

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4121963


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3-1

1(conservative force )


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f2

f1-f2

1

2

2

f1f2


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3 potential energy

3potential energy


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SIJ


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37

ab


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1

2

3

3


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4


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F x dx

38


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38


3 2 work energy theorem

3-2 work-energy theorem

1system of particles

external frce(internal force)

39


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2

12


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1

2AicEp


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3

4


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3-3

1


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2


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3-4

1(center of mass)

i


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.


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2theorem of motion of center - of mass)

n

316

317


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318


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3(conservation law of momentum)


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:

:


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3-5


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3-6

  • 1angular momentum of a particle)

r p


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kg m2/s


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2law of conservation of angular momentum

1


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t

2


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moment of force)

OrFOL


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