Based on the law of conservation of energy, which state meant is false

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Question:

Based on the law of conservation of energy, which statement is false?

a. Energy is lost when machines don't work right.

b. We can't add more energy to the universe.

c. We can't destroy energy that exists in the universe.

d. Energy changes from one form to another.

Answer:

option a. Energy is lost when machines don't work right.

Explanation:

The law of conservation of energy, which is the principle stated by the first law of thermodynamics, states that the energy of the universe is conserved. The energy can be transformed or exchanged between a system and its surrounnding, but the total energy will remain constant.

Then, it is true that we cannot add more energy to the universe (option b.), because, the total energy of the universe remains constant; we can't destroy energy that exists in the universe (option c.), because, again, as said, the total energy of the universe remains constant; and, also true, energy changes from one form to another, e. g. work to heat, heat to kinetic energy, kinetic energy to potential energy, and so on.

So, options b, c, and d are true.

On the other hand, the statement a. is false: it is not true that energy is lost when machines don't work right; what do happen is that the efficiency of the machine is low and much of the energy, instead of being transformed into useful work, is transformed into heat that is released to the surroundings.