Docstoc

Calculating Mechanical Advantage _ Efficiency

Document Sample
Calculating Mechanical Advantage _ Efficiency Powered By Docstoc
					Calculating Mechanical
Advantage & Efficiency
Equations

   MA = Fout ÷ Fin
             Fout

            MA F
                in



   Efficiency = (Wout ÷ Win) x 100
              Wout

            Eff W
                 in
Problems 1 & 2

   Calculate the mechanical advantage
    of a crowbar to which you apply 100
    N of force to lift a 250 N rock.
   2.5
   Calculate the mechanical advantage
    of a hammer if you apply 125 N and
    the hammer applies 2,000 N.
   16
Problems 3 & 4

   Find the efficiency of a machine that
    does 800 J of work if the input work
    is 2,400 J.
   33%
   Find the force needed to lift a 2,000
    N weight using a machine with a
    mechanical advantage of 15.
   133 N
Problems 5 & 6
   You are attempting to lift a 445 N rock
    with a lever that has a mechanical
    advantage of 9.5. What force must you
    apply?
   46.8 N
   The efficiency of a crowbar is 60%. What
    work is needed to lift an object if the
    crowbar does 120 J of work?
   200 J

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:25
posted:10/8/2011
language:English
pages:5