Solution Found!
Figure 12-31 shows the anatomical structures in the lower
Chapter , Problem 13(choose chapter or problem)
Figure 12-31 shows the anatomical structures in the lower leg and foot that are involved in standing on tiptoe, with the heel raised slightly off the floor so that the foot effectively contacts the floor only at point P. Assume distance a = 5.0 cm, distance b = 15 cm, and the person’s weight W = 900 N. Of the forces acting on the foot, what are the
(a) magnitude and
(b) direction (up or down) of the force at point A from the calf muscle and the
(c) magnitude and
(d) direction (up or down) of the force at point B from the lower leg bones?
Questions & Answers
QUESTION:
Figure 12-31 shows the anatomical structures in the lower leg and foot that are involved in standing on tiptoe, with the heel raised slightly off the floor so that the foot effectively contacts the floor only at point P. Assume distance a = 5.0 cm, distance b = 15 cm, and the person’s weight W = 900 N. Of the forces acting on the foot, what are the
(a) magnitude and
(b) direction (up or down) of the force at point A from the calf muscle and the
(c) magnitude and
(d) direction (up or down) of the force at point B from the lower leg bones?
Step 1 of 4
Distance between A to B: \(a=5 \mathrm{~cm}=0.05 \mathrm{~m}\)
Distance between B to point P where tips touches ground: \(b=15 \mathrm{~cm}=0.15 \mathrm{~m}\)
Weight of the person: W = 900 N
It is to be understood that when the person stands tiptoe at a point P, the weight of the person is concentrated at that point. Thus the reactionary force at point P is upwards and equal to the weight of person in magnitude,
\(F_{P}=900 N\) .................................................{1}