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Is angular momentum of a system always c...

Is angular momentum of a system always conserved ?

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The momentum of a system is conserved

In case of rolling friction force can act in forward and backward direction both. The angular momentum of a system will be conserved only about that point about which external angular impulse is zero.

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A bomb, initially at rest, explodes into several pieces. (a) Is linear momentum of the system conserved? (b) Is kinetic energy of the system conserved? Explain.