PASCO ME-6807A Human Arm Model - Manual (Page 27)

®
M E - 6 8 0 7 A D e m o n s tr a ti o n s : C o m p l e x M o v e m e n t s
27
“Free Throw”
When using the arm model to throw a ball (or make any other
sudden movement), do not let the parts of the arm crash into
the end stops. PASCO recommends the “free throw” as a dem-
onstration performed by an instructor, rather than a student
activity.
1. Set up the arm
model as illustrated.
The force sensor will
be held in your hand
and is connected to
the triceps insertion
point using standard
cord. Elastic cord is
connected between
the biceps insertion
point and the upper
shoulder pulley.
2. Set the lower shoulder stop to
hold the shoulder at about 130°.
Move the upper shoulder stop all the
way up.
3. Turn the wrist all the way back.
4. Place the ball in the model’s hand.
5. By hand, set the elbow to about 90°; then pull the force sensor to hold it in that
position.
6. Pull the force sensor with a swift motion. After the initial pull, maintain tension
on the cord and allow the arm to be lowered slowly back to the starting position.
The shoulder rotates back and elbow extends, tossing the ball up and forward.
triceps
elbow
shoulder
inelastic cord
elastic cord