1 / 10

Introduction to Energy

Introduction to Energy. What Is Energy?. Changes are constantly occurring in the world. Every change requires energy. Energy – ability to cause change. Energy is Found in Many Forms. Electromagnetic energy – energy in waves Mechanical – energy in physical movement Heat – thermal energy

hafwen
Download Presentation

Introduction to Energy

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. Introduction to Energy

  2. What Is Energy? • Changes are constantly occurring in the world. • Every change requires energy. • Energy – ability to cause change

  3. Energy is Found in Many Forms • Electromagnetic energy – energy in waves • Mechanical – energy in physical movement • Heat – thermal energy • Nuclear – energy stored in the nucleus of an atom • Kinetic – energy an object in motion has • Potential – stored energy due to an object’s position

  4. Units of Energy – the Joule • Units of energy • Kg * m2/s2 • Abbreviated J

  5. Solving for Kinetic Energy KE = ½ mv2 KE – kinetic energy (in J) m – mass (in kg) v – velocity (in m/s)

  6. Example of Solving for Kinetic Energy • A jogger with a mass of 60 kg is moving at a speed of 3 m/s. What is the kinetic energy?

  7. Potential Energy • Elastic potential energy – energy stored by something that can stretch or compress • Chemical potential energy – energy stored in chemical bonds • Gravitational potential energy – energy stored in objects due to their position above the Earth’s surface

  8. Solving for Potential Energy GPE = mgh GPE – gravitational potential energy (in J) m – mass (in kg) g – 9/8 m/s2 h – height (in m)

  9. Example of Solving for Potential Energy • What is the gravitational potential energy of a ceiling fan that has a mass of 7 kg and is 4 m above the ground?

  10. Changing GPE • As an object begins to fall it has GPE and KE. • As the object gets closer to the ground it has less GPE and more KE. • Example – An 80 kg skydiver jumps from a 10 m platform. What is the GPE of the skydiver at the top of the platform? What is the GPE of skydiver after falling 5 m?

More Related