A 77-kg person standing is standing on one foot on a very smooth gym floor. He i

Question

A 77-kg person standing is standing on one foot on a very smooth gym floor. He is lifting his body by pivoting his foot upwards through a 30.0? angle, balancing all of his weight on the ball of the foot. The forces on the bones from the rest of his body are due to the Achilles tendon and the ankle joint as shown in the figure. The Achilles tendon acts perpendicular to a line through the eel and toes; it is this line that has rotated upward through 30.0?. Assume that the weight of the foot is negligible compared with that of the rest of the body. (a) What are the magnitude and direction of the force that the floor exerts on the man?s foot?

Explanation / Answer

77*9.8*.045= F*.16*cos30 F = 245.06N

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