1 / 30

Work and Machines: Exploring Energy and Efficiency

This chapter covers the concepts of work and machines, including their measurement, different forms of energy, and the principles of simple machines. It also explains the relationship between force, distance, and power, as well as the laws of conservation of energy.

marydjackson
Download Presentation

Work and Machines: Exploring Energy and Efficiency

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. Chapter 8 Work and Machines

  2. Objectives of chapter 8 • Define and explain work • Measure and calculate work

  3. Work • What happens when an object changes its position by moving in the direction of the force that is being applied

  4. Measuring Work • Work = Force x Distance • Example • Work = 2 newtons x 10 meters • Work = 20 joules

  5. Joule • The metric unit of work

  6. Force, work and distance is always related Force= work / distance Distance = work / force

  7. Power • The amount of work a person does within a given period of time

  8. Watt • The unit used to measure power.

  9. Energy • The ability to do work

  10. Kinetic Energy • Energy of motion

  11. Potential Energy • Stored energy

  12. Forms of Energy • Chemical- stored in bonds • Heat- moving particles • Mechanical- energy in moving objects • Nuclear- stored in the nucleus • Radiant- associated with light • Electrical- causes electrons to move

  13. Generator • A device used to convert mechanical energy

  14. Law of Conservation of Energy • Energy cannot be created or destroyed

  15. Simple Machine • A tool with few parts that makes it easier or possible to do work

  16. Lever • A simple machine containing a bar that can turn around a fixed point

  17. Fulcrum • A fixed point around which a lever rotates

  18. Effort Force, Fe • The force applied to a machine by the user

  19. Resistance Force, Fr • The force applied to a machine by the object to be moved

  20. Work Output • Work put into a machine by its user

  21. Work Output • Work done by a machine against resistance

  22. Efficiency • How well a machine performs

  23. Mechanical advantage, MA • Factor by which a machine multiplies the effort of force

  24. Effort arm • The distance between the fulcrum and the effort force of a lever.

  25. Resistance arm • The distance between the fulcrum and resistance force of a lever.

  26. Pulley • A simple machine made up of a rope, chain, or belt wrapped around a wheel.

  27. Inclined Plane • A simple machine made up of a ramp, used to lift an object.

  28. Screw • A simple machine made up of an inclined plane wrapped around a straight piece of metal.

  29. Wedge • A simple machine made up of an inclined plane or pair of inclined planes that are moved.

  30. Wheel and Axle • A simple machine made up of a wheel attached to a shaft.

More Related