1 / 7

The Nature of Energy

Delve into the fundamental aspects of energy, including kinetic and potential forms. Learn about the ability of energy to cause change, its various forms, and conversions between them. Explore kinetic energy in moving objects and potential energy stored in stationary objects. Gain insight into calculations and examples illustrating energy concepts.

jcraig
Download Presentation

The Nature of 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. The Nature of Energy Physical Science Ms. Pollock 2008-2009

  2. What is energy? • Involved in every change • Energy – ability to cause change • Electrical, chemical, radiant, or thermal • All different forms of same thing • Object in motion or at rest • Conversion from one form to another

  3. Kinetic Energy • Objects in motion • Kinetic energy – energy of a moving object due to its motion • Dependent on mass and speed • Kinetic energy (in joules) = ½ mass (in kg) X speed (in m/s2) • KE = ½mv2 • SI unit joule

  4. Kinetic Energy Example • A jogger whose mass is 60 kg is moving at a speed of 3 m/s. What is the jogger’s kinetic energy? KE = ½mv2 KE = ½(60 kg)(3 m/s)2 KE = ½(60 kg)(9 m2/s2) KE = 270 J

  5. Potential Energy • Objects not in motion • Potential energy – stored energy due to position • Converted to kinetic energy when motion occurs • Elastic potential energy – energy stored in something that can stretch or compress

  6. Potential Energy • Chemical potential energy – energy stored in chemical bonds • Gravitational potential energy – energy stored by objects due to their position above Earth’s surface • Gravitational potential energy (J) = mass (kg) X acceleration of gravity (m/s2) X height (m) • GPE = mgh

  7. Gravitational Potential Energy Example • What is the gravitational potential energy of a ceiling fan that has a mass of 7 kg and is 4 m above the ground? GPE = mgh GPE = (7kg)(9.8 m/s2)(4 m) GPE = 274 J

More Related