1. Kinetic Energy and Potential Energy
Chapter M5
Section 2 Energy Conversions
Kinetic Energy and Potential Energy
An energy conversion is a change from one form of energy to another. Any form of energy can change into any other form of energy.
As the skateboarder on the next slide travels up and down the half-pipe, his energy changes back and forth between kinetic energy and potential energy.

2. Chapter M5
Section 2 Energy Conversions

3. Kinetic Energy and Potential Energy, continued
Chapter M5
Section 2 Energy Conversions
Kinetic Energy and Potential Energy, continued
Stretching a rubber band stores elastic potential energy in the rubber band.
When you let the rubber band go, it goes back to its original shape. It releases its stored-up potential energy as it does so.

4. Conversions Involving Chemical Energy
Chapter M5
Section 2 Energy Conversions
Conversions Involving Chemical Energy
Chemical energy is stored in the food you eat. Your body uses this chemical energy to function.
Energy Conversion in Plants The chemical energy in the food you eat comes from the sun’s energy. Plants use photosynthesis to convert light energy into chemical energy, as shown on the next slide.

5. Chapter M5
Section 2 Energy Conversions

6. Conversions Involving Chemical Energy, continued
Chapter M5
Section 2 Energy Conversions
Conversions Involving Chemical Energy, continued
The Process Continues Plants change light energy into chemical energy. The chemical energy in the food you eat is changed into another kind of chemical energy that your body can use.
Your body then uses that energy to give you kinetic energy that you use in everything you do.

7. Why Energy Conversions Are Important
Chapter M5
Section 2 Energy Conversions
Why Energy Conversions Are Important
Energy conversions are needed for everything we do. Heating our homes, getting energy from a meal, and many other things use energy conversions.
Machines, such as a hair dryer, help harness energy and make that energy work for you.

8. Why Energy Conversions Are Important, continued
Chapter M5
Section 2 Energy Conversions
Why Energy Conversions Are Important, continued
Some common energy conversions that involve electrical energy are shown in the table below.
Alarm clock
electrical energy  light and sound energy
Battery
chemical energy  electrical energy
Light bulb
electrical energy  light and thermal energy
Blender
electrical energy  kinetic and sound energy

9. Chapter M5 Energy and Machines
Section 2 Energy Conversions
Energy and Machines
A machine can make work easier by changing the size or direction (or both) of the force needed to do the work. Some machines allow you to use less force over a greater distance to do the same amount of work.
Some machines help you use energy by converting it into the form of energy that you need.

10. Chapter M5
Section 2 Energy Conversions