PASCO ME-6807A Human Arm Model - Manual (Page 25)

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25
Demonstrations: Complex Movements
Introduction
In the following demonstrations, the arm model is set up to perform motions involv-
ing simultaneous rotation of the shoulder and elbow. They are shown here with two
force sensors; however they can also be done without sensors. Note that each cord in
these arrangements makes both joints move and, therefore, represents combinations
of muscles (not just the biceps or triceps).
“Curling Lift”
1. Set up the arm model with two force sensors as illustrated. The
lower force sensor is attached to the rod clamped to the model’s base. The
upper force sensor will be held in your hand.
2. Pull the upper force sensor. Both shoulder and elbow rotate in the
same direction to lift the hand.
3. Attach the 100 g mass to the hand and repeat to see how the additional load
affects the muscle forces.
The graph
shows data for
lifting the
100 g mass.
Required Parts of Human Arm Model
Arm
Cord (2 piece)
100 g mass
Ball
45 cm rod
Sensor-mounting clamp and stud
Other Required Equipment
Angle Sensor PS-2139
2 Force Sensors PS-2104 or PS-2189
C-clamp SE-7286 (6-pack)
biceps
triceps
elbow
shoulder