Energy and Energy Resources Energy Conversions
Changing one form of energy into another Word: Definition: Examples: Doodle: Changing one form of energy into another conversion Light Chemical light Potential Kinetic chemical
conservation Energy is not created or destroyed; it is transformed Word: Definition: Examples: Doodle: Energy is not created or destroyed; it is transformed conservation energy Energy has always existed
Energy Conversions Energy conversion- a change from one form of energy to another. What are some other forms of energy?? Any form of energy can change to another Some forms of energy change into more than one other form of energy Attention Grabber- knock something off the table “not” on purpose and discuss the gravitational potential energy and the change to kinetic energy of the falling object
Potential and Kinetic energy at a skate park Picture is a link to phet simulation involving skateboarding and energies. You can change everything from the skateboarder to the friction! Great simulation.
Energy Conversions Light Heat Sound Chemical Mechanical Electrical There are other types of energy beside potential and kinetic: Light Heat Sound Chemical Mechanical Electrical
Conversions involving chemical energy Why do people say breakfast is “the most important meal of the day”? Answer: Breakfast refuels the energy you need for much of the rest of the day
Conversions involving chemical energy FOOD = ENERGY Chemical energy of food is converted into kinetic energy when you are active. It is converted into thermal energy to maintain body temperature. Activity- after the “FOOD=ENERGY” tell the students to stand up and do 3 jumping jacks. Their body just did an energy conversion.
Chemical Energy (FOOD) Kinetic Energy (moving) Thermal Energy (heat)
Where does the chemical energy in food come from? THE SUN!!!
Energy Conversions in Plants Question to class: what is the process called of plants converting light energy into food/chemical energy? PHOTOSYNTHESIS Light energy is given to plants to form chemical energy which is given to us for kinetic or thermal energy! (or others..)
Energy Conversions in Plants ALL food’s energy comes from the SUN EVEN meat… animals eat plants and we eat animals
Why Energy Conversions are Important Energy for your body Blend a smoothie Listen to a radio Ride a rollercoaster Turn on a light Microwave hot cocoa Food for plants Watch T.V. Run a computer Play a guitar Play soccer Think. Toast your strudel Walk Heat your home Live Drive a car Blow dry your hair Question to class: why are energy conversions important??
Conversions involving electrical energy Common conversions of electrical energy Alarm Clock Electrical energy light energy and sound energy Battery Chemical energy electrical energy Light bulb Electrical energy light energy and thermal energy Blender Electrical energy kinetic energy and sound energy
Chemical energy in your body is converted into kinetic energy when your muscle fibers contract and relax Your legs transfer this kinetic energy to the pedals by pushing them around in a circle The chain moves and transfers energy to the back wheel, which gets you moving! The pedals transfer this kinetic energy to the gear wheel, which transfers kinetic energy to the chain
Review In your own words…what is energy conversion? In plants, energy is transformed from A. kinetic to potential B. light to chemical C. chemical to electrical D. chemical to light Describe a case in which electrical energy is converted into thermal energy. How does your body get the energy that it needs?
Review Answers Energy conversion is the process of changing one form of energy into another In plants, energy is transformed from A. kinetic to potential B. light to chemical C. chemical to electrical D. chemical to light An electrical heater can change electrical energy into heat energy Your body gets energy from the food you eat…which can all be traced back to the Sun