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Levers and Mechanical Advantage Lab

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					                       Levers and Mechanical Advantage Lab



Procedure:
   1. Turn on Sparks unit by pushing the black power button on the bottom.
   2. Choose force, pull positive by touching. Choose Show on the bottom middle of
      screen by touching. Go to top left and page forward to page 2:
      digits.
   3. Find the green play arrow on the bottom left of the screen – this is
      where you will tell the SPARK to start and stop gathering data.
   4. Find the resistance force (output force) by attaching the force meter to the bottle
      of gravel. Push start and record. Push stop.
   5. Set up the lever systems as shown in each diagram.
   6. Use your force meter probe to find the effort force (input force) needed to lift the
      resistance force by starting, recording, and stopping.

First Class Lever; Draw and label a first class lever.




Diagram of lever       Effort           Resistance     Effort        MA= resistance (N)
system                 distance (cm)    force (N)      force (N)           Effort (N)
     20                     25 cm
                25


     20                    20 cm
                  20


    20                     15 cm
             15
Second Class Lever; Draw and label a second class lever.




Diagram of lever        Effort           Resistance     Effort        MA= resistance (N)
system                  distance (cm)    force (N)      force (N)           Effort (N)
     10      25              50 cm



     10     5               30 cm




Third Class Lever; Draw and label a third class lever.




Diagram of lever        Effort           Resistance     Effort        MA= resistance (N)
system                  distance (cm)    force (N)      force (N)           Effort (N)
          10 25              35 cm


       10       25          15 cm




1.. In a first class lever, as the effort distance decreases the mechanical advantage
_____________________(increases or decreases)
2. In a second class lever, as the effort distance decreases the mechanical advantage
___________________(increases or decreases)
3. In a third class lever, as the effort distance decreases the mechanical advantage
___________________(increases or decreases)
4. Which class of lever is pictured with the arm on top of lab? ___________________
In a third class lever there is little or no mechanical advantage. Our body uses third class
levers to stabilize (keep lever steady), change the direction of the effort, or raise a
resistance to height. What is happening in the picture of arm at top of lab?
_______________________________________________________
5. How do levers help the human body?
________________________________________________________________________
_

				
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posted:9/18/2012
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