how to understand the concept of applying the concept of conservation of energy when xternal forces r zero.......also ow can we determine wch force is doing work and wch is not???///
Dear ocean,
Consider a generic interaction between 2 objects, as shown to the right. A mass m1 moving with a speed v1 interacts with a mass m2 moving with a speed v2.
Leibniz was a contemporary of Newton. He noticed that for many types of interactions the sum of the quantity mv2 was the same value before and after the interaction:
He called this quantity the vis viva, or "living force," and for him its conservation was central to his thinking about interactions.
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All the best.
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Sagar Singh
B.Tech, IIT Delhi
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