1 / 11

Work and Energy

Work and Energy. F. . d. Work = Fd cos . Where F is the force d is the displacement  is the angle between the force and the direction. Work = Fd cos .  = ZERO in this situation!!!. F. d. Energy – What is it?. The ability to do work. Types of Energy. Kinetic

lars-salinas
Download Presentation

Work and 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. Work and Energy

  2. F  d Work = Fd cos  • Where • Fistheforce • disthedisplacement • istheanglebetweentheforce and thedirection

  3. Work = Fdcos •  = ZERO in this situation!!! F d

  4. Energy – What is it? • The ability to do work

  5. Types of Energy • Kinetic • Gravitational Potential • Elastic Potential • Heat • Light • Sound • Electrical • Chemical • Nuclear Mechanical Energy

  6. Energy - Kinetic • Kinetic Energy • This is the energy that an object possesses due to its motion • If the mass of a body is m and its speed is v then its kinetic energy is given by KE= ½ m v2

  7. Work-Energy Principle • W = ΔKE = ½ mvf2 – ½ mvi2 • The net work done on an object (by a net force) is equal to a change in kinetic energy of the object

  8. Energy - Potential • Potential Energy – the energy of an object due to its position, shape, or condition • An system acquires potential energy when work is done against another force

  9. Energy - Potential Gravitational Potential Energy • This is the energy of an object associated with its position in a gravitational field (work done against the force of gravity to put it there) GPE= mgh • m = mass of the object • h = height of object above some fixed position • g = the acceleration due to gravity

  10. Energy - Potential • Elastic Potential Energy • This is the energy that an object possesses due to its position of being stretched or deformed • FOR A SPRING (or similar)… EPE= ½ k x2 • x = amount of stretch • k = the spring constant (a characteristic of the object being stretched)

  11. The Principle of Conservation of Energy • Energy can be transformed from one form to another, but it cannot be created nor destroyed, i.e. the total energy of a system is constant • Energy is measured in joules and it is a scalar quantity

More Related