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10.3: Procedures

  • Page ID
    29170
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    You will determine whether forces are balanced.

    1. Draw a table in which to record balanced and unbalanced forces for each situation.  Do not fill in data until you have read the instructions for obtaining that data. 

    Table \(\PageIndex{1}\): Balanced and unbalanced forces for each situation

    System

    Forces Acting + Direction

    Balanced or Unbalanced

    Straight Arm lifting Dumbbells

       

    Straight Arms holding Dumbbells

       

    Bicep Curl with Dumbbells

       

    Bicep Curl holding Dumbbells

       

    Mass Placed on Meter Stick

       

    Mass Sitting on Meter Stick

       

    Pendulum at Position A

       

    Pendulum at Position B

       

    Mass Pushed

       

    Mass Sliding

       

    Mass Stopped

       

    Dumbbells

    1. Stand with your arms at your side, and hold one dumbbell in each hand.  Lift the dumbbells with straight arms (left image), and hold them in place for 10 seconds.  Then lift the dumbbells with a bicep curl (right image), and hold them in place for 10 seconds.  Each person on the team should try this.  Name or describe the forces acting on the dumbbells for each action with the dumbbells, in your data table, and use an arrow to indicate the direction of each force.  Record whether forces on the dumbbells were balanced or unbalanced for each action with the dumbbell, in your data table.

    clipboard_e6ed1171aa7f6e1f61c708afc6e605117.png
    Figure \(\PageIndex{1}\): https://gethealthyu.com/Investigation/elevated-bicep-curl/

    Mass on a Bridge

    1. Make a long but stable bridge with the meter stick and 2 lab chairs.  Place the 1000 gram mass in the center of the meter stick.  Then allow the mass to sit on the bridge for 10 seconds. Remove the mass from the meter stick bridge.  Name or describe the forces acting on the mass for each action with the mass, in your data table, and use an arrow to indicate the direction of each force.  Record whether forces were balanced or unbalanced for each action with the mass, in your data table.  

    Pendulum

    1. Make a pendulum that hangs from the center of the meter stick bridge, using a heavy key chain and ribbon by tying the ribbon in a bow (so it may easily be untied).  Start the pendulum swinging, and observe its motion.  Name or describe the forces acting on the mass for each position of the pendulum, in your data table, and use an arrow to indicate the direction of each force.  Record whether forces were balanced or unbalanced for each position of the key chain, in your data table.  Record whether the forces on the key chain were balanced or unbalanced for each position, in your data table.

    clipboard_e96204129e2a383a70aee1b78b8201e4d.png
    Figure \(\PageIndex{2}\): Pendulum

    Sliding

    1. Place the 1000 gram mass on the table and give it a good push to send it sliding; allow the mass to slide on the table and come to a stop.  Name or describe the forces acting on the mass for each action with the mass, in your data table, and use an arrow to indicate the direction of each force.  Record whether forces were balanced or unbalanced for each action with the mass, in your data table. 

    clipboard_ee1d4b35d1a5963f18db3ef343f8c692e.png
    Figure \(\PageIndex{3}\): Sliding mass

    Contributors and Attributions


    10.3: Procedures is shared under a CC BY license and was authored, remixed, and/or curated by LibreTexts.

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