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Posted by on Monday, January 10, 2011 at 11:07am.

A crowbar is used as a lever. The effort force of 40 newtons moves 3 meters. The resistance force of 54 newtons moves 2 meters. What is the efficiency of the lever?

A) 100% because energy must be conserved
B) 90%
C) 25%
D) 18%

i need help. i don't know how to figure this one out

  • Integrated Physics and Science - , Monday, January 10, 2011 at 11:53am

    Output work = 108 J.
    Input work = 120 J

    Efficiency = 108/120 = 9/10 = 90%

    (Energy can be converted to heat in friction at the fulcrum, or useless potential energy distorting the crowbar)

  • Integrated Physics and Science - , Tuesday, January 11, 2011 at 10:57am

    oh okay. i get it now. Thank you very much

  • Integrated Physics and Science - , Tuesday, January 11, 2011 at 5:28pm

    Southeast Academy Switched-on online?

  • Integrated Physics and Science - , Tuesday, November 15, 2011 at 4:37pm

    What is the unit for IMA?

  • Integrated Physics and Science - , Thursday, June 28, 2012 at 1:17pm

    IMA is unitless

  • Integrated Physics and Science - , Monday, November 26, 2012 at 8:42am

    yes

  • Integrated Physics and Science - , Wednesday, July 2, 2014 at 2:19pm

    A crowbar is used as a lever. The effort force of 40 newtons moves 3 meters. The resistance force of 54 newtons moves 2 meters. What is the efficiency of the lever?

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