Record your guesses in your science journal. Bellringer What do the following objects have in common: a plant, a Bunsen burner, a pendulum. Can you think of three more objects that have same the common link? Record your guesses in your science journal.

Energy Conversions

Objectives Describe an energy conversion. Give examples of energy conversions for the different forms of energy. Explain how energy conversions make energy useful. Explain the role of machines in energy conversions

Energy conversions 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. Often, one form of energy changes into more than one other form.

Kinetic Energy and Potential Energy

Elastic Potential Energy The energy you put into stretching the rubber band becomes elastic potential energy. 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.

Chemical Energy conversions Chemical energy comes from the food you eat. Your body uses chemical energy to function. This energy comes from a chemical change that was made possible by the sun's energy. Photosynthesis uses light energy to make new substances that have chemical energy. In this way, light energy is changed into chemical energy.

Light energy to Chemical energy

Objectives Describe an energy conversion. Give examples of energy conversions for the different forms of energy. Explain how energy conversions make energy useful. Explain the role of machines in energy conversions

Chemical Energy conversions 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.

Question So the energy you use originally came from where?

Why Energy Conversions Are Important Conversions Involving Electrical Energy 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

What do you know? What are some energy conversions you can think of? Involving light- Involving heat- Involving sound- Involving electrical-

Objectives Describe an energy conversion. Give examples of energy conversions for the different forms of energy. Explain how energy conversions make energy useful. Explain the role of machines in 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 convert energy and make that energy work for you.

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. Machines as Energy Converters Machines help you use energy by converting into the form that you need.

Question What are some machines that have made modern life easier? How do they use energy? How is it converted into a form you can use?

Objectives Describe an energy conversion. Give examples of energy conversions for the different forms of energy. Explain how energy conversions make energy useful. Explain the role of machines in energy conversions