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Energy

This chapter explores the different forms of energy, such as light, sound, electrical, chemical, heat, nuclear, and mechanical energy. It also discusses the concepts of kinetic and potential energy, energy conservation, energy-mass conversion, work, and power.

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Energy

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  1. Energy Chapter 4

  2. Energy • Ability to cause change • Lots of forms • Light/radiant • Sound • Electrical • Chemical • Heat/thermal • Nuclear • Mechanical

  3. Kinetic Energy • Energy of motion • Depends on • Mass of object • Speed of object • Ek = ½ mv2 • Unit: Joule (J)

  4. Potential Energy • Stored energy due to position • Elastic • Stored in something that can be stretched or compressed • Chemical • Stored in chemical bonds

  5. Potential Energy • Gravitational • Energy stored by object due to position above Earth’s surface • Depends on • Mass of object • Height of object • Eg = mgh • Unit: Joule (J)

  6. Energy Conservation • Energy cannot be created or destroyed • But it can be TRANSFORMED • Light Bulb • Food • Radio

  7. Energy Conservation • Total energy remains constant

  8. Energy-Mass Conversion • E = mc2

  9. Work • Transfer of Energy • Force moves an object over a distance • Movement must occur in direction of force

  10. Work…and Energy • When work is done, energy is transferred • Doing work on object increases object’s energy • W = Fd • Unit: Joule (J)

  11. Power • Rate of energy transfer • Rate at which work is being done • Power = Work/time • Unit: Watt (W) • 1 HP = 746 W

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