This image is of my younger brother (dressed in blue) walking across a bench about 9 feet off the ground. This image is significant, because this event is a rite of passage for kids going from a lower scout group to a scout group for older teenagers. This challenge is to walk across without falling over and once at the end of the plank, turn around carefully and fall backwards; trusting that he will be caught by other scouts waiting to catch him. It is more challenging than it appears, due to how the bench holders are often shaking. This photo was chosen, since it is something I once did and got to see my brother undertake. Furthermore, it is an annual event and known to be rather nerve-racking for the person walking in the air.
The bench is the focus. The forces in this image are the weight of “nervous scout” acting on bench from gravity (red arrow), the force of bench acting on “nervous scout” from normal (blue arrow), the weight of bench acting on arms from gravity (orange arrow), the force of arm #1 acting on bench from body, the force of arm #2 acting on bench from body, the force of arm #3 acting on bench from body, the force of arm #4 acting on bench from body, and finally, the force of arm #5 acting on bench from body. Arms in yellow. Pivots would be the furthest arms.
Torque would be Tau = Force (N) * Distance from Pivot (m)
Matt's Mind 