1 / 27

Energy and Its Forms

Ch 15.1. Energy and Its Forms. Energy and Work. Work is done when a force moves an object a distance Work is a transfer of energy. Energy is the ability to do work Both measured in J. Kinetic Energy. Energy of motion Depends on mass and speed. KE = ½ mv2 SI Units: KE- m- v-.

gen
Download Presentation

Energy and Its Forms

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Ch 15.1 Energy and Its Forms

  2. Energy and Work • Work is done when a force moves an object a distance • Work is a transfer of energy • Energy is the ability to do work • Both measured in J

  3. Kinetic Energy • Energy of motion • Depends on mass and speed • KE = ½ mv2 SI Units: • KE- • m- • v-

  4. KE Practice • A 0.10 kg bird is flying at a constant speed of 8 m/s. What is the birds kinetic energy? • Given: • Formula: • Solve:

  5. Math Practice pg 448 • 1. • 2. • 3. • 4.

  6. Potential Energy • Energy that is stored due to position or shape • Stored energy turns into KE

  7. Potential Energy • PE that depends upon an objects height • Increases with increased height • PE = mgh SI Unit • m- • g- • h- • PE that is stretched or compressed • Object springs back to its original shape Gravitational PE Elastic PE

  8. Forms of Energy • Energy associated with motion and position of everyday objects • Sum of PE and KE • Total PE and KE of all the microscopic particles in an object • Particles move faster, becoming warmer Mechanical Thermal

  9. Forms of Energy • Energy stored in chemical bonds • Energy associated with electric charges Chemical Electrical

  10. Forms of Energy • Form of energy that travels through space in the form of waves • Energy stored in the atomic nucleus • Fission- releases energy, splits apart • Fusion- releases energy, comes together Electromagnetic Nuclear

  11. 15.2 Energy Conversion and Conservation

  12. Conservation of Energy • Energy cannot be created or destroyed • It is transferred or converted

  13. Energy Conversion • Energy can be converted from 1 form to another • Process of changing energy – energy conversion • Gravitational PE converts into KE as an object falls

  14. Energy Conversions • Pendulums • PE constantly converted back and forth to KE • Stays in motion due to weight • Pole Vaults

  15. Energy Conversion Calculations • KE + PE = KE + PE (Beginning) (End) • KE= • PE=

  16. Conversion Practice • A 1.50kg brick is dropped from rest and hits the ground at a speed of 26m/s. Ignore air resistance, calculate PE before the brick was dropped. • Given: • Formula: • Solve:

  17. Math Practice pg 458 • 1. • 2. • 3.

  18. Energy and Mass • Albert Einstein • Theory of Relativity • E = mc2 • Energy and mass are equivalent and can be converted into each other • c= speed of light 3.0 x 108 m/s

  19. Ch 15.3 Energy Resources

  20. Nonrenewable Energy • Exists in limited quantities • Once used, it can’t be replaced except over the course of millions of years • Natural Gas • Coal • Uranium • Also known as fossil fuels

  21. Renewable Energy • Can be replaced in relativity short periods of time

  22. Renewable Energy • Hydroelectric • Energy from flowing water • Solar • Sunlight converted into useable energy

  23. Renewable Energy • Geothermal • Thermal energy beneath Earths surface • Others • Biomass Energy • Energy stored in living things • Hydrogen Fuel • Creates electricity by reacting hydrogen and oxygen

  24. Conserving Energy Resources • Reduce energy needs • Increase the efficiency of energy use

More Related