Understanding Energy Changes

What is energy?

• Energy is a form of currency.

• Energy is a type of matter.

• Energy is the speed of light.

• Energy is the capacity to do work or produce change.

Name one type of energy transformation.

• Electrical energy to gravitational energy

• Chemical energy to kinetic energy

• Mechanical energy to sound energy

• Nuclear energy to thermal energy

What happens to energy when you turn on a light bulb?

• Electrical energy is stored in the bulb.

• Electrical energy is converted into light and thermal energy.

• Thermal energy is emitted as sound energy.

• Light energy is converted into electrical energy.

Can energy be created or destroyed? Why or why not?

• Energy can be both created and destroyed.

• Energy can be destroyed but not created.

• Energy can be created but not destroyed.

• No, energy cannot be created or destroyed.

What is an example of potential energy?

• A rock at the top of a hill.

• A book resting on a table.

• A car driving down a road.

• A compressed spring.

How does kinetic energy differ from potential energy?

• Kinetic energy is energy of motion; potential energy is stored energy based on position.

• Kinetic energy is related to temperature, while potential energy is related to speed.

• Potential energy is energy of motion; kinetic energy is stored energy.

• Kinetic energy is always greater than potential energy.

What is the law of conservation of energy?

• Energy is only created, not transformed.

• Energy cannot be created or destroyed, only transformed.

• Energy can be created and destroyed.

• Energy can be lost but not gained.

Give an example of energy changing from one form to another.

• Nuclear energy to sound energy in a radio.

• Potential energy to gravitational energy in a falling object.

• Electrical energy to light energy and thermal energy in a light bulb.

• Chemical energy to kinetic energy in a moving car.

What type of energy is stored in food?

• Nuclear energy

• Kinetic energy

• Chemical energy

• Thermal energy

How do plants use energy from the sun?

• Plants use sunlight to create oxygen only.

• Plants absorb sunlight to grow taller without any chemical process.

• Plants use sunlight to produce heat for their roots.

• Plants use energy from the sun to perform photosynthesis, converting sunlight into chemical energy.