What does the law of conservation of energy state?

What does the law of conservation of energy state?

• A. Energy can be created or destroyed under certain conditions.
• B. Energy cannot be created or destroyed; it can only be transformed or transferred.
• C. Energy is always conserved in form but not in amount.
• D. Energy is only present as heat in a closed system.

Answer: (B)

Energy cannot appear or disappear; it can only change form or be transferred. In any closed system, the total amount of energy stays the same, even as it shifts between types like kinetic, potential, chemical, electrical, or thermal. For example, a falling object converts potential energy to kinetic energy, a light bulb changes electrical energy into light and heat, and energy can pass between objects through work and heat. The best choice says exactly that: energy cannot be created or destroyed; it can only be transformed or transferred, so the total energy remains constant. The other ideas are incomplete or incorrect because energy does not have to exist only as heat, and it isn’t conserved only in form or only under certain conditions.

Energy cannot appear or disappear; it can only change form or be transferred. In any closed system, the total amount of energy stays the same, even as it shifts between types like kinetic, potential, chemical, electrical, or thermal. For example, a falling object converts potential energy to kinetic energy, a light bulb changes electrical energy into light and heat, and energy can pass between objects through work and heat. The best choice says exactly that: energy cannot be created or destroyed; it can only be transformed or transferred, so the total energy remains constant. The other ideas are incomplete or incorrect because energy does not have to exist only as heat, and it isn’t conserved only in form or only under certain conditions.