Law of Conservation of Energy Review

What does the Law of Conservation of Energy state?

• Energy can be created but not destroyed.

• Energy can be destroyed but not created.

• Energy can be created and destroyed.

• Energy cannot be created or destroyed.

In the context of energy conservation, what defines a closed system?

• A system that only exchanges matter with its surroundings.

• A system that only exchanges energy with its surroundings.

• A system that does not interchange matter or energy with its surroundings.

• A system where energy is always increasing.

When a ball is dropped from a height, what happens to its potential and kinetic energy?

• Potential energy increases, and kinetic energy decreases.

• Potential energy decreases, and kinetic energy increases.

• Both potential and kinetic energy remain constant.

• Both potential and kinetic energy decrease.

What does Einstein's famous equation E=mc² imply about mass and energy?

• Mass and energy are distinct and cannot be interchanged.

• Energy can be converted into mass, but mass cannot be converted into energy.

• Mass and energy are interchangeable expressions of the same underlying entity.

• Mass is always conserved, but energy is not.