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Energy!

Energy!. p. 58 4/21 Forms of Energy Foldable. IQ: Decide which of the following contain energy: - A donut - Charcoal - A plant - A car parked at the top of a hill - A radio playing music. 7 Forms of Energy. Heat Chemical Light Electrical Mechanical Sound Nuclear. Energy.

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Energy!

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  1. Energy!

  2. p. 58 4/21 Forms of Energy Foldable IQ: Decide which of the following contain energy: - A donut - Charcoal - A plant - A car parked at the top of a hill - A radio playing music

  3. 7 Forms of Energy • Heat • Chemical • Light • Electrical • Mechanical • Sound • Nuclear

  4. Energy Definition: • Is the ability to do work or cause a change . Interesting facts: • There are many different types of energy. • Measure in Joules (J) • All matter has energy!

  5. 1) Heat Energy (Kinetic) Definition: the energy of moving particles of matter, present in everything! Examples: Solar, Fire, Body, electricity, friction, Nuclear, Geothermal,etc Pic/Symbol: Interesting Info: There is more Heat Energy in an Iceberg (more particles) than there is in a boiling pot of water!

  6. Heat vs. Temperature Heatdepends on the number of particles Temp. depends on the speed of particles Which has more Heat? Which has more Temp? Boiling pot of water vs. Iceberg Ice Sculpture vs. Lit Match

  7. 2) Light/Radiant Energy (Kinetic) Definition: Energy from the Electromagnetic Spectrum (EMS) Examples: Sun, light bulb, lightning, UV rays etc. Picture/Symbol: Interesting Information: Light energy is used to cook or heat up food in the microwave.

  8. 3) Sound Energy (kinetic) Definition: Energy created by vibrating objects. Examples: sound from a speaker, radio, TV, thunder, or someone’s voice Picture/Symbol: Interesting Information: Sound travels through a medium and the speed of sound depends on the density of the medium!

  9. 4) Chemical Energy (Potential) Definition: Energy stored in the chemical compounds (bonds) of food & fuel Examples: Fossil Fuels (Oil, Gas, & Coal) Wood, food, batteries etc. Pic/Symbol: Info: One of our most abundant and important sources of energy!

  10. 5) Electrical Energy (Kin./pot.) Definition: The energy of moving electrons. Examples: Power plant, batteries, TV, static, current, etc. Picture/Symbol: Interesting Information: Alternating Current= from the sockets when you plug something in! Direct Current= Battery (1 direction – to +)

  11. 6) Nuclear Energy (potential) • Definition: Uses atomic reactions to produce heat, radiation, electricity and light, from the nucleus of an atom. Examples: • Fission (split) in nuclear power plants and fusion (fuse) of radioactive nuclei on the sun. Picture/Symbol: Info: A lot of energy from a little bit of matter.

  12. 4/22 Energy forms cont’d IQ: On your foldable from yesterday, add one more example to energy forms 1 thru 5.

  13. Energy forms brainpop

  14. 7)Mechanical Energy (pot. & kin.) Definition:The energy of an object that is due to its position (potential) or motion (kinetic). Examples: Roller coaster, car, walking, blinking, breathing, wind, ocean Picture/Symbol: Interesting Information: ME Total ME= PE + KE

  15. 7a) Potential Energy • Potential energy is stored energy • Energy of position with the potential to move. Ex) Standing on a diving board, a stretched rubberband. • GPE = mgh or weight x height(Joules) • Highest at highest height.

  16. 7b) Kinetic Energy • Kinetic energy is the energy of motion. Highest at bottom of hill. • Any object that is moving has kinetic energy. • Ex) Ball Moving, Wind, Sound, skiier going downhill.

  17. There is an inverse relationship between potential and kinetic energy • As PE increases KE decreases and as PE decreases KE increases. Total ME stays same.

  18. 7b)Kinetic Energy Equation • m = mass (in kg), v = velocity (in m/s), and KE = kinetic energy (in J = joules). • There is a direct relationship between KE and mass and between KE and v squared. • Therefore as the mass goes up, KE goes up. And as v goes up (faster), KE goes up. KE= ½ mv2 (Joules)

  19. Energy during downhill skiing • http://www.physicsclassroom.com/mmedia/energy/se.html

  20. OQ: Give examples of at least 5 forms of energy from around you. Ex. projector- electrical

  21. OQ: Identify the type of energy represented by the following: a. an infrared lamp in a restaurant keeps food warm ___________________________ b. a student listens to an Ipod___________________________ • A student picks up his backpack ___________________________ • a hamburger is eaten at lunch _______________ • Reactions on the sun that produce heat and light ___________________________

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