A 60 kg person stands on one foot on a force plate. Ground reaction acts 40 mm anterior to the ankle joint. The foot centre of mass is 60 mm from the trochanter–knee–ankle line, and foot mass is 0.8 kg. Find nearest magnitude of ankle moment.
The ground-reaction moment is approximately 60g×.040=23.54 N m. Foot weight contributes an opposing moment .8g×.060≈.471 N m. Net magnitude≈23.54−.471=23.07 N m, nearest 23 N m, A. Millimetres must first be converted to metres.
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