Coach book Lesson 12

Energy in motion.

Kinetic Energy

Stored energy.

Potential Energy

Energy Transformations

Fill in the Blank

Energy in motion is

Fill in the Blank

Stored energy is called

Gravitational energy

Energy of an object due to its position above the ground.

energy stored in bonds that bind atoms together

Chemical Energy

energy stored in an object due to a change in its shape

Elastic Energy

energy stored in the nucleus of an atom that is released when nuclei join together or split apart.

Nuclear Energy

Multiple Choice

The previous slide showed examples of what type of energy?

• Kinetic Energy

• Potential Energy

• Celcius Energy Drink

• Red bull energy

energy of motion, such as the motion of objects (examples: flowing water, wind, machines, your body when you move)

Mechanical Energy

energy of moving particles that make up matter (examples: energy that maintains your body's temperature, geothermal energy)

Thermal Energy

energy that travels as electromagnetic waves (examples: visible light, microwaves, x-rays...)

Radiant Energy

energy given off by vibrating objects; energy we can hear. Examples: voices, music

Sound Energy

energy of moving electrical charges (ex. lightning, electrons in a circuit)

Electrical Energy

Multiple Choice

All of the following are examples of Kinetic energy except...

• mechanical energy

• elastic energy

• radiant energy

• thermal energy

Multiple Select

Select all examples of potential energy.

• Gravitational energy

• chemical energy

• elastic energy

• nuclear energy

Energy can be transformed, or changed, from one form to another.

Green plants change radiant energy (light) to chemical energy.

Chemical Energy

A hair dryer changes electrical energy into heat and mechanical energy.

Electrical Energy

Examples of energy transformations

Potential to Mechanical Energy

Different forms of Potential energy can be changed into mechanical energy. Gravitational potential energy turns into mechanical energy as a roller coaster rolls downhill on its track. Elastic energy in a stretched spring is transformed into mechanical energy as the spring snaps back.
Stored chemical energy can be used to make things move, too. Gasoline burning in a car engine is stored chemical energy changed into thermal energy.

Multiple Choice

What energy transformation takes place after you release a rubber band?

• elastic to mechanical

• thermal to gravitational

• sound to radiant

• radiant to chemical

Energy Transformations in your body.

When you eat food, you take in chemical energy. Some of that energy is changed into mechanical energy to move your muscles. Some is changed into electrical energy that is used by your nervous system. Some of the chemical energy from the food you eat is transformed into thermal energy. This keeps your body at the right temperature. Your body stores some of the chemical energy to use later.

Multiple Choice

Green plants change radiant (light) energy into ________ energy that your body uses to move, regulate temperature and electrical energy for your nervous system.

• thermal

• chemical

• radiant

• gravitational

Transformations of Electrical Energy

Many devices transform electrical energy into other forms of energy.
- A lamp wire carries electrical energy to a light bulb
- A hair dryer changes electrical energy into heat and mechanical energy.
- Computers transform electrical energy into sound, light (radiant), and mechanical energy.

Conservation of Energy in Transformations

As you have learned, during many energy transformations, some energy changes to heat. When that heat is not useful or is even harmful, it is called waste heat. Waste heat is still energy. Remember, energy is neither created nor destroyed - it simply changes forms.

Multiple Choice

Which of the following is a form of potential energy?

• sound

• chemical

• thermal

• mechanical

Multiple Choice

You learned that a motor uses the magnetic field produced by an electric current to spin an armature. What kind of transformation takes place inside a motor?

• chemical energy transforms to magnetic energy.

• thermal energy to electrical energy

• gravitational energy to chemical energy

• electrical energy to mechanical energy

Multiple Choice

Which of the following is the best example of a form of kinetic energy being transformed into a form of potential energy?

• Photosynthesis - plants use light to make sugar

• combustion of fuel being broken down chemically to produce heat and light

• in a generator, an armature spinning in a magnetic field produces electric current.

• in a battery, a chemical reaction releases electrons that can flow as electric current.

Multiple Choice

Which of the following is not a source of stored chemical energy that can be turned into a form of kinetic energy?

• a battery in a toy car

• food

• the nucleus of an atom

• fossil fuels