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What is Energy ?

What is Energy ?. What is Energy?. Energy is the ability to do work. Energy is the ability to cause a change. Energy can change an object’s: motion shape temperature color . 2. Energy is all around us!. You can hear energy as sound when someone talks.

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What is Energy ?

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  1. What is Energy?

  2. What is Energy? Energy is the ability to do work. Energy is the ability to cause a change. Energy can change an object’s: motion shape temperature color 2

  3. Energy is all around us! • You can hear energy as sound when someone talks. • You can see mechanical energy every time you move. • You can see energy as light from the sun or a lamp. • You can feel it as heat warms things up.

  4. What are the Forms of Energy? • Electrical • Light • Sound • Chemical • Heat/Thermal • Mechanical kinetic potential

  5. Kinetic Energy Energy due to motion. • KE of an object depends upon two variables: • the mass (m) of the object • the speed (v) of the object.

  6. Calculating Kinetic Energy A formula to find the kinetic energy of any body based on its velocity.

  7. Potential Energy Stored energy that could cause change in the future. Potential energy is stored energy--energy ready to go.  A lawn mower filled with gasoline, a car on top of a hill, and students waiting to go home from school are all examples of potential energy. Types of potential energy • gravitational • compressed spring • chemical • magnetic

  8. Mechanical Energy • Mechanical energy is the energy that is possessed by an object due to its motion or due to its position. Mechanical energy can be either kinetic energy (energy of motion) or potential energy (stored energy of position) .

  9. Chemical Energy • Chemical energy is made when substances react and form new substances. • Food, batteries, and fuels such as oil and gasoline are stored chemical energy.

  10. What is Sound? • Sound is a form of energy produced by a vibration or a back and forth movement of an object. • Sound is a wave of vibrations that spread from its source of its matter.

  11. What is light? • Light is something that allows us to see objects. • Light is a form of energy. • Light is produced by the vibrations of electrically charged particles.

  12. Properties of Light • Light travels in a straight path. • Light doesn’t travel through all objects. These are defined as opaque. • Light can be absorbed and changed to heat.

  13. Properties of Light Continued • Light bounces off or is reflected from some kinds of opaque objects. • Some objects let all light pass through them are known as: transparent • Some objects let some light pass through them are known as: translucent Angles of Reflection

  14. Bending Light LabWrite down responses on your note page. • Problem: What does light do when it travels from one medium or state of matter (air) through another medium (water)? • Hypothesis: • Test and Observe: Follow steps from the lab sheet. • Conclusion:

  15. Light Changes Direction • Light bends or refracts as it passes from one medium (form of matter: solid, liquid or gas) to another. • Refraction of Light Virtual Tutorial

  16. What is ThermalEnergy? • Thermal energy is the total of all the kinetic and potential energy of the atoms in an object. • When any form of matter gets warmer, the kinetic energy of its atoms increases. • The object’s particles move faster, so its thermal energy increases. • A change in thermal energy can lead to a change in phase or state of matter. • Temperature is a measure of thermal energy.

  17. Forms of Energy Energy Forms • Heat/thermal • Electrical • Chemical • Mechanical: potential kinetic • Light /Radiant What Happens? • Objects warm. Food cooks. • Lights on. / Machines run. • Organisms move and grow. • Flashlights light up. • Sled sits on top of a hill. • Sled slides down the hill. • Plants grow. / Lasers cut.

  18. What is the Transformation of Energy? Energy can change and move from one object to another. chemical > electrical > light Where does the energy of a lit light bulb transfer to after the flashlight has been on for a while? Heat energy transfers into the air.

  19. Forms of Energy Stationstaions • Identify and record the different forms of energy in your science notebook as you rotate throughout the various stations. Reflections: • Describe what you learned in the energy stations. • What was interesting? • What do you want to learn more about?

  20. What are some transfers and/or transformations of energy that are taking place in our classroom, in our school or at home?

  21. Transformation of Energy A. A. B. B. C.

  22. Energy Transformation How is energy changing when a toaster is in use? A toaster uses electrical, mechanical, and thermal energy.

  23. Energy Interactive Online Resources • Energy and the Environment: http://www.childrensuniversity.manchester.ac.uk/interactives/science/energy • Science for Kids: Sound and Hearing http://acswebcontent.acs.org/scienceforkids/index.html#Sound

  24. Online Energy Videos and More • The Energy Story: http://energyquest.ca.gov/story/index.html • Mechanical Energy (animation) http://app.discoveryeducation.com/player/?assetGuid=2768797e-a7a0-45f5-b7a4-812cd3422f7d&fromMyDe=0&isPrinterFriendly=0&provider=&isLessonFromHealth=0&productcode=DETB&isAssigned=false&includeHeader=YES&homeworkGuid= • Energyhttp://www.energyeducation.tx.gov/energy/section_1/topics/index.htm • Kids and Energy http://www.kids.esdb.bg/index.html

  25. Discovery Resources • Fundamental: Energy Makes it Happen • Exploration: Forms of Energy • E-book: Forms of Energy • Video: Sources of Energy • Video: What is light?

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