Which statement about conservation of energy is true?

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Multiple Choice

Which statement about conservation of energy is true?

Energy can move and change form, but the total amount of energy in a system stays the same if nothing external adds or removes energy. That means energy can transfer between objects or appear in different forms—kinetic, potential, thermal, light, sound, electrical, and so on—but it isn’t created or destroyed in the process. Think of a swinging pendulum: as it moves, energy shifts between kinetic energy (moving) and gravitational potential energy (height). If you switch on a light, electrical energy becomes light and a bit of thermal energy. In a vacuum, energy can still be carried away as light or other waves, but the total energy in the system remains accounted for. Given that, the true statement is that energy cannot be created or destroyed, only transformed into another type or transferred. The other ideas—energy always being released as heat, energy being created during a reaction, or energy disappearing in a vacuum—don’t hold because energy can take many forms and can move without becoming heat or vanishing.

Energy can move and change form, but the total amount of energy in a system stays the same if nothing external adds or removes energy. That means energy can transfer between objects or appear in different forms—kinetic, potential, thermal, light, sound, electrical, and so on—but it isn’t created or destroyed in the process.

Think of a swinging pendulum: as it moves, energy shifts between kinetic energy (moving) and gravitational potential energy (height). If you switch on a light, electrical energy becomes light and a bit of thermal energy. In a vacuum, energy can still be carried away as light or other waves, but the total energy in the system remains accounted for.

Given that, the true statement is that energy cannot be created or destroyed, only transformed into another type or transferred. The other ideas—energy always being released as heat, energy being created during a reaction, or energy disappearing in a vacuum—don’t hold because energy can take many forms and can move without becoming heat or vanishing.

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