Experiment 4: biceps curl – PASCO ME-6807A Human Arm Model User Manual

Page 30

Text mode
Original mode

H u m a n A r m M o d e l

T e a c h e r ’ s N o t e s

Experiment 3: Triceps Force versus Perpendicular Load

Typical Result:

Analysis:

1. The rela-

tionship is approximately
proportional with a slope of
about 9. 2. For these typical
results, accurate predictions
would have been: (1) The
triceps muscle resists the
load. (2) The triceps force
is greater than the load
force. (3) For a load of 1 N,
the muscle force is approximately 9 N.

Further Analysis:

1. Free-body diagram:

2. The linear acceleration of the forearm is zero; therefore, the net force is zero. 3. The angular acceleration is
zero; therefore, the net torque is zero.

Experiment 4: Biceps Curl

Part A, typical result:

Part A, analysis:

1. The

graph is not linear. 2. As the
elbow flexes, the biceps force
increases.

force

applied by
upper arm

triceps

force

load

force