1 / 19

Is The Hand Doing Work? 2B2 p 43

Is The Hand Doing Work? 2B2 p 43. My hand has been exerting a force on the string to support the weight as the object is moving from A to B. Has my hand done any work?. I now keep my hand at the same place and slowly pull in the string (twist over fingers) raising the object from D to C.

fbruce
Download Presentation

Is The Hand Doing Work? 2B2 p 43

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. Is The Hand Doing Work?2B2 p 43

  2. My hand has been exerting a force on the string to support the weight as the object is moving from A to B. Has my hand done any work?

  3. I now keep my hand at the same place and slowly pull in the string (twist over fingers) raising the object from D to C. Has my hand done work in this case?

  4. Which Way Should You Pull?1C3 p 45

  5. Which Way Should You Pull? 35N Fe on B What is the purpose of the pulley?

  6. Gravity and Simple Pulley1C1 p 51

  7. When you let go of the two masses, what happens? What did happen? What is your explanation?

  8. What is the Trade-Off for a Smaller Force (Pulleys)? 3B1 p 57

  9. What is the Trade-Off for a Smaller Force How much force does it take to slowly lift the mass? We call this force the weight of the object.

  10. Fin Fin Fout Fout Mount pulley to top support Fasten weight to other pulley String the pulley Hang weight to end of string Add enough weight until the other weight rises Measure din and dout Record weightin and weightout din dout

  11. Fin Fin Fout Fout Workin = Fin x din Workout = Fout x dout Ideal M.A. = din / dout Actual M.A. = Fout / Fin Efficiency = Wout / Win din dout

  12. - Input Work = Input Force x Input Distance - Output Work = Output Force x Output Distance How does the work output relate to the work input - Mechanical Advantage Actual = Force Output / Force Input - Mechanical Advantage Ideal = Distance Input / Distance Output What does the mechanical advantage of a lever tell you? - Efficiency = Work Output / Work Input - Can you expect the efficiency of a machine to be over 100%?

  13. What is the Trade-Off for a Smaller Force How does the output distance compare to the input distance? How does the output force, compare to the input force?

  14. What is the Trade-Off for a Smaller Force How does the output distance compare to the input distance? How does the output force, compare to the input force?

  15. MA = 1

More Related