According to the law of conservation of energy, which statement must be true?
A. There is only one form of energy.
B. The total energy of a system can decrease only if energy leaves the system.
C. A system cannot take in additional energy.
D. Potential energy can only change to kinetic energy.
Answer (2)
The law of conservation of energy dictates that energy cannot be created or destroyed, and the only true statement is that the total energy of a system can decrease if energy exits the system. Multiple forms of energy exist, and energy can be transformed rather than simply lost or gained. Therefore, option B is the correct answer. ;
The law of conservation of energy indicates that energy cannot be created or destroyed, only transformed. Therefore, the statement that the total energy of a system can decrease only if energy leaves the system (Option B) is true. The other options present false statements regarding energy forms and transformations.
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