H u m a n S t r u c t u r e s S e t
H u m a n B a c k M o d e l
20
012-13878A
Human Back Model: Force Vector Diagram
The following diagram shows the force vectors acting on the human back model.
Load Cells
The Load Cells directly measure the forces exerted on the back model. The structure is shown with two Load Cells mea-
suring the tension in the cords representing lower back muscles. The experiment can be performed using more Load Cells
mounted in place of the Straight Connectors in the base.
Suggestions
Experiment with the ‘back’ at different angles and use the Load Cells to measure the tension in the cord.
What is the affect of increasing or decreasing the angle of the ‘back’?
Experiment with the amount of weight attached to the end of the ‘arm’.
Does doubling the weight also double the tension in the cords attached to the Load Cells?
W
b
T
F
y
F
x
Cord
Hooked
Mass
Load Cells
Large
Slotted
Masses
W
OPTION: Put Load Cells in
place of the Straight
Connectors.