Conservation of Energy

What does the Law of Conservation of Energy state?

• Energy cannot be created or destroyed but it can be transferred or transformed.

• Energy can be created, but it can't be destroyed.

• Energy can be created or transformed, but it can't be destroyed or transferred.

• It is important to use less energy to help save the planet.

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If a speaker uses 700 kJ of energy to play music, how much sound energy did the speaker make?

• 400 kJ

• 500 kJ

• 600 kJ

• 700 kJ

If a lightbulb turns 30 J of electrical energy into light and heat. If the lightbulb made 20 J of light energy, how much heat energy did it make?

• 0 J

• 10 J

• 20 J

• 30 J

As a pendulum swings, it converts energy between...

• electrical energy and magnetic energy.

• gravitational energy and kinetic energy.

• kinetic energy and elastic energy.

• gravitational energy and elastic energy.

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At the top of a swing, all of a pendulum's energy is

• kinetic energy.

• gravitational energy.

• electrical energy.

• elastic energy.

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At the bottom of its swing, all of a pendulum's energy is

• kinetic energy.

• gravitational energy.

• elastic energy.

• electrical energy.

If an object speeds up,

• the kinetic energy increases.

• the kinetic energy decreases.

• the gravitational energy increases.

• the gravitational energy decreases.

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If an object is moved down from a high shelf to a lower shelf,

• the kinetic energy increases.

• the kinetic energy decreases.

• the gravitational energy increases.

• the gravitational energy decreases.

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If an object loses mass,

• the kinetic energy increases.

• the kinetic energy decreases.

• the gravitational energy increases.

• the gravitational energy decreases.

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