Demonstrate and measure the forces at work inside the human arm
Students see what happens when they throw a ball.
See the interaction of the bicep and tricep muscles
Use probeware to measure the forces involved
The Teaching Challenge
It's no easy task to simulate the muscles and motion of an actual human arm. It is a structure with a f
ull range of motion including throwing, curling and extension.
Any potential lab simulation should be able to:
Capture muscle tension, shoulder and elbow joint movement data
Measure force and angle simultaneously
Link tricep and bicep muscle action to arm motion
FREE THROW - Measure the work done by the arm and the resulting kinetic energy delivered to the ball during a free throw.
The PASCO Solution
The Human Arm Model can serve a myriad of functions:
Pull on a rope with a Force Sensor to activate arm motion, and measure both
muscle tension and shoulder and elbow joint rotation. The Human Arm Model can
perform many types of motion such as extending and lifting an object, curling,
or throwing a ball overhand. Different arm muscles are activated depending on
which pulleys are selected. Static force measurements can also be made to see
how the muscle tension changes at various arm positions.
Solution at a Glance
Human Arm Model (PS-2611)
PASPORT Force Sensor (PS-2104)
Xplorer GLX (PS-2002)
This solution also requires software and an interface or a standalone datalogger. For more information or to order products separately, see below.
Extension - This graph captures the sharp increase in the tension (force) of the bicep muscle as the arm is fully extended. The tricep muscle cord is pulled with a Force Sensor, while a second Force Sensor measures the tension on the bicep muscle cord.
CURL - As the bicep muscle cord is pulled a short distance, the end of the arm moves through a very large distance, showing the mechanical advantage of the arm. The load at the end of the arm can be varied.
How It Works
View this demonstration video of the Human Arm Model to see the set up and procedure.