Energy Conversions • Potential Energy: The energy an object has due to its position • Kinetic Energy: The energy an object has because of its motion
Here’s a song that will help us learn the difference between the two…
Energy Conversions • Which picture shows balloons with highkinetic energy? http://www.bing.com/images/search?q=deflated+balloons&view=detail&id=D52F00C1048DEA41FF3D593A8902A771277C4D3C&first=36
Energy Conversions At letter “W” does the roller coaster car have high potential energy or high kinetic energy?
Energy Conversions At letter “X” does the roller coaster car have high potential energy or high kinetic energy?
Energy Conversions • You may have noticed that energy can be converted from potential to kinetic and back again. High potential energy Medium potential energy High kinetic energy
Energy Conversions • There are other types of energy beside potential and kinetic: • Light • Sound • Mechanical • Heat • Chemical • Radiation • Electrical
Energy Conversions • Each type of energy can be converted into another form through various processes: Light energy Chemical energy
Light energy Chemical energy The process of PHOTOSYNTHESIS converts light energy from the sun into chemical energy that the plant stores as sugar.
Chemical energy Mechanical energy The chemical energy stored in food, like corn, is converted into mechanical energy when we digest it. We use the mechanical energy to perform life functions.
Energy Conversions • All forms of energy on Earth can be traced back to the sun. This hamburger is full of chemical energy
Energy Conversions The chemical energy stored in the hamburger came from the food the cow ate.
Energy Conversions The cow used mechanical energy to chew the hay that was produced through photosynthesis
Energy Conversions Photosynthesis is the process of making food using energy from light energy.
Energy Conversions Light Energy Chemical Energy Mechanical Energy Chemical Energy
Energy Conversions • Let’s Summarize: • Potential energy is energy that is stored in an object • Kinetic energy is energy that comes from motion • Energy can be converted from potential to kinetic and back again • All energy on earth can be traced back to the sun