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 ConversionsEnergy Conversions

ObjectivesObjectives

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 conversionsEnergy conversions An energy conversion is a change An energy conversion is a change

from one form of energy to from one form of energy to another. another.

Any form of energy can change Any form of energy can change into any other form of energy. into any other form of energy.

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

Kinetic Energy and Kinetic Energy and Potential EnergyPotential Energy

Elastic Potential EnergyElastic Potential Energy

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

When you let the rubber band go, When you let the rubber band go, it goes back to its original shape. it goes back to its original shape.

It releases its stored-up potential It releases its stored-up potential energy as it does so.energy as it does so.

Chemical Energy Chemical Energy conversionsconversions

Chemical energy comes from the food you Chemical energy comes from the food you eat. eat.

Your body uses chemical energy to function.Your body uses chemical energy to function. This energy comes from a chemical change This energy comes from a chemical change

that was made possible by the sun's energy. that was made possible by the sun's energy. Photosynthesis uses light energy to make Photosynthesis uses light energy to make

new substances that have chemical energy. new substances that have chemical energy. In this way, light energy is changed into In this way, light energy is changed into

chemical energy. chemical energy.

Light energy to Chemical Light energy to Chemical energyenergy

ObjectivesObjectives

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

• 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.

Chemical Energy Chemical Energy conversionsconversions

QuestionQuestion

So the energy you use originally So the energy you use originally came from where?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 clockAlarm clock electrical energy electrical energy light and sound light and sound energyenergy

BatteryBattery chemical energy chemical energy electrical energy electrical energy

Light bulbLight bulb electrical energy electrical energy light and thermal light and thermal energyenergy

BlenderBlender electrical energy electrical energy kinetic and sound kinetic and sound energyenergy

What do you know?What do you know?

What are some energy conversions What are some energy conversions you can think of?you can think of?

Involving light-Involving light- Involving heat-Involving heat- Involving sound-Involving sound- Involving electrical-Involving electrical-

ObjectivesObjectives

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.

QuestionQuestion

What are some machines that have What are some machines that have made modern life easier?made modern life easier?

How do they use energy? How do they use energy? How is it converted into a form you can How is it converted into a form you can

use?use?

ObjectivesObjectives

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