Forms of Energy

Forms of Energy

Middle School

​

Learning Objectives

• Define energy and explain the difference between potential and kinetic energy.

• Identify and describe different forms of potential energy.

• Identify and describe different forms of kinetic energy.

• Explain energy transformation and the Law of Conservation of Energy.

Key Vocabulary

​

Potential Energy

Stored energy that is waiting to do work based on an object's position or state.

​

Kinetic Energy

The energy of motion, which is actively performing work on other objects or particles.

​

Chemical Energy

Energy stored in the bonds of atoms and molecules, released during chemical reactions.

​

Nuclear Energy

Energy stored in the nucleus of an atom, released when atoms are split apart.

​

Energy Transformation

The process where energy changes from one specific form into another different form.

What is Energy?

• Energy is the ability to do work or cause motion or change.

• Potential energy is stored energy that is waiting to do work.

• Kinetic energy is the energy of motion, which is performing work.

Multiple Choice

A car is parked at the top of a steep hill. What primary form of energy does it possess due to its position?

• Sound Energy

• Kinetic Energy

• Electrical Energy

• Potential Energy

​

​

Types of Potential Energy

Elastic Energy

• Elastic energy is stored in an object when its shape is changed by a force.

• Stretching a rubber band or compressing a spring stores this type of potential energy inside.

• The energy is released when the object returns to its original, unforced shape.

Nuclear Energy

• Nuclear energy is the powerful energy stored inside the nucleus, or center, of an atom.

• This is the incredible energy that holds the tiny particles of the nucleus tightly together.

• This massive amount of energy can be released when the nucleus of an atom splits apart.

Multiple Choice

The energy stored in a stretched rubber band is an example of what type of potential energy?

• Gravitational Energy

• Elastic Energy

• Nuclear Energy

• Chemical Energy

​

​

Types of Kinetic Energy

• Mechanical energy is motion that performs work, allowing objects to move.

• Thermal energy comes from the vibration of atoms; more motion creates more heat.

• Electrical energy is the energy of moving electrons, like in lightning.

• Radiant energy travels in transverse waves, including visible light and X-rays.

• Sound energy moves in longitudinal waves caused by vibrations, creating sounds.

Multiple Choice

The heat you feel from a fire is a result of the rapid motion and vibration of atoms. What form of kinetic energy is this?

• Thermal Energy

• Mechanical Energy

• Electrical Energy

• Radiant Energy

Energy Transformation and Conservation

• Energy can change from one form to another.

• Energy cannot be created or destroyed, only transformed.

• The total amount of energy in a system always stays the same.

Multiple Choice

According to the Law of Conservation of Energy, what happens to the total amount of energy in an isolated system during an energy transformation?

• It is destroyed.

• It remains the same.

• It increases.

• It decreases.

​

Common Misconceptions About Energy

Misconception	Correction
Energy can be created.	Energy cannot be created or destroyed; it only changes from one form to another.
Energy is “used up” or disappears.	Energy is conserved. It transforms into other forms but is never lost.
An object at rest has no energy.	An object at rest can have potential energy from its position or composition.
Energy and force are the same thing.	Force is a push or a pull, while energy is the ability to do work.

Multiple Choice

When you stretch a hair band and then let it go, why does it snap back to its original shape?

• Because elastic potential energy stored while stretching is released when it returns to its original shape.

• Because the hair band loses all its energy while being stretched.

• Because gravity pulls the hair band back into place.

• Because the hair band creates new energy when you release it.

Multiple Choice

Which example shows sound energy being produced?

• A phone screen lighting up in a dark room

• A bell ringing when you push a bicycle brake

• Sunlight warming your skin

• A TV remote sending signals

Multiple Choice

A lamp is plugged in and turned on. Analyze the energy transformations that occur to produce light.

• Nuclear energy transforms into electrical and thermal energy.

• Chemical energy transforms into radiant and thermal energy.

• Electrical energy transforms into radiant and thermal energy.

• Mechanical energy transforms into electrical and radiant energy.

Multiple Choice

A bouncing ball eventually stops bouncing and comes to rest. What is the most accurate conclusion based on the Law of Conservation of Energy?

• The ball ran out of potential energy and could no longer bounce.

• The ball's energy was destroyed with each bounce.

• The ball's kinetic and potential energy were transformed into sound and heat energy.

• The ground absorbed all the energy from the ball.

​

Summary

• Energy is the ability to do work, existing as potential and kinetic energy.

• Potential energy includes chemical, nuclear, elastic, and gravitational forms.

• Kinetic energy includes mechanical, thermal, electrical, radiant, and sound forms.

• Energy cannot be created or destroyed, only transformed from one form to another.

Poll

On a scale of 1-4, how confident are you about the concepts covered in today's review?

• 1

• 2

• 3

• 4