10.3: Procedures

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You will determine whether forces are balanced.

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

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.

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

Mass on a Bridge

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

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.

Sliding

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.

Contributors and Attributions

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