Question
Select the best words or phrases that describe how the law of conservation of energy limits the creation of
perpetual motion machines.
Perpetual motion machines are mechanical systems that continue to do work indefinitely without the input
of external energy. Although scientists and engineers had attempted to design such a system for many
years, such a machine is now widely recognized as impossible because of th
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This law states that energy can neither be
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It can only be converted from one formm to another. The goal of a
perpetual motion machine is to convert energy to useful work. As energy is used to do work, this energy is
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the machine. Furthermore, this conversion of energy iS inefficient because some of
the energy is always lost as heat. Eventually, a perpetual motion machine must stop because all of the
energy stored in the system has been 1ost. The only way to start the machine in motion again is to
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Answer
1. Conservation of energy limits perpetual motion machines.
2. Energy cannot be created or destroyed, only converted.
3. Perpetual motion machines aim to convert energy to work.
4. Energy is lost as heat during conversion, making perpetual motion inefficient.
5. Eventually, all energy is lost and the machine stops.
6. Starting the machine again requires input of external energy.