Question

statement 1: the total energy of a system is always conserved irrespective of whether external forces act on the system. statement 2:if external forces act on a system , the total momentum and energy will increase in the absence of dissipative forces .It is true or false.
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Answer 1

Answer:

False. In an elastic collision of two bodies, the momentum and energy of the system is conserved.

(b) False. Some energy is lost in heat, so it is not conserved.

(c) False. It is true only for conservative forces. For non-conservative forces, work done over one cycle is not zero.

(d) True. Some energy is lost in internal friction and heat.

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