Angular Momentum 角动量.

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Presentation transcript:

Angular Momentum 角动量

Three fundamental principles Momentum principle Energy principle ?.......

Think about the Earth orbiting the Sun. What is conserved during the orbit?

Think about the Earth orbiting the Sun. What is conserved during the orbit? Answer: The translational angular momentum with respect to the Sun.

What is the direction of the vector ? The direction depends on the direction of rotation. It is perpendicular (垂直) to both and .

Angular momentum from the vector cross product Translational angular momentum around a point A: Magnitude: Direction:

Example: Find the angular momentum of the particle around points A, B and C.

What is the direction of the vector <0,4,0> x <0,0,3> ?

What is the direction of the vector <0,0,3> x <0,4,0> ?

Even an object moving in a straight line can have angular momentum about some point.

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