Energy Transformation & Conservation
Learning Target I will describe how different forms of energy are transferred into other forms.
Think-Pair-Share What happens to your hands when you rub them together? What are other ways you can get warm?
Guided Reading Preview the red headings. Write a how or what question for each heading. As you read, write answers to your questions. Ex. Q:What is energy transformation? A: Energy transformation is ….
Forms of Energy Thermal Radiant (electromagnetic) Sound Chemical Electrical Mechanical
Energy Transformation Energy transformation – a change of one form of energy to another form. Some are single transformations & others are a chain of transformations
Original Energy Transformation Most energy transformations can be traced back to the sun: the original source of energy for life on earth.
Simple Energy Transformation Sunlight (electromagnetic energy) shines on a person's face and changes to thermal energy. Why this happens: As your skin absorbs energy the molecules move faster which produces heat.
Think-Pair-Share What happens to the chemical energy in the food you eat? Transformed to thermal energy & mechanical energy
Single Transformations Sound energy can be transferred to your eardrum as kinetic energy (movement energy).
Single Transformations Chemical energy stored in it is transferred to its surroundings as: thermal energy sound energy kinetic energy.
Multiple Transformations The battery transfers stored chemical energy as electrical energy. The electrical energy is transferred to the surroundings by the lamp as light energy and thermal energy.
Multiple Transformations Example Old style steam locomotive In this old steam engine, steam is used to move pistons, which make the wheels turn. Radiant Chemical Thermal Mechanical
How It Works: Radiant energy from the sun is absorbed by plants. Plants produce chemical energy through photosynthesis. The plants die and become fossil fuels (chemical energy). In the locomotive the chemical energy is burned (thermal energy). The steam created from the thermal energy turns the wheels to make the locomotive move. (mechanical energy)
Conservation of Energy Law of conservation of energy - energy cannot be created nor destroyed. It can only be transferred or transformed.
Think-Pair-Share What form of energy is mechanical energy most often transformed? thermal energy
Energy and Friction Friction causing kinetic energy to transform into thermal energy. Ex. The top has friction with the air and the ground causing its kinetic energy to transform into thermal energy.
Energy and Matter Einstein’s theory of relativity: energy can be created by destroying matter. Matter – anything that has mass and takes up space. *All objects are made of matter!
Practice Battery–powered alarm clock In this battery-powered alarm clock, the hands move and an alarm rings when it’s time to wake up. Chemical Electrical Mechanical Sound
Practice Solar-powered car Most cars run by using a battery for electrical energy and gasoline for chemical energy. A solar powered car runs using only energy from the sun. Radiant Electrical Mechanical
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Practice What energy transformations take place inside a working battery?
Practice Mechanical and Thermal Energy (Don’t forget friction)
Assignment Complete Part 5 on the purple worksheet. Complete the following exit slip:
Exit Slip Energy cannot be created or destroyed. It can only be transformed from one form to another. Identify all the energy transformations that occur when you operate a hair dryer.
Exit Slip Revealed Transformations: Electrical Thermal (heat coils) Mechanical (fan) Have student fill in the blank