During the push-off phase of a running stride the ground reaction force under the 1" metatarsal was measured to be 900.95 N at 30°. At this instant the triceps surae (gastrocnemius-soleus complex) is pulling on the calcaneus with a force of 1,222.75 N at an angle of 65°, and the tibialis anterior muscle is pulling with a force of 484.33 N at an angle of 60° on the medial cuneiform bone. The mass of the runner is 62 kg. Assume that the foot is a single rigid body, no other ankle musculature is active and the system is static. NOTE: All angles are reported relative to the right horizontal. Complete the free-body diagram of the foot shown below. a. What is the net horizontal talocrural joint reaction force? b. What is the net vertical talocrural joint reaction force? c. What is the magnitude of resultant taloCTural joint reaction force? d. What is the orientation of the resultant talocrural joint reaction force relative to the right horizontal?

During the push-off phase of a running stride the ground reaction force under the 1" metatarsal was measured to be 900.95 N at 30°. At this instant the triceps surae (gastrocnemius-soleus complex) is pulling on the calcaneus with a force of 1,222.75 N at an angle of 65°, and the tibialis anterior muscle is pulling with a force of 484.33 N at an angle of 60° on the medial cuneiform bone. The mass of the runner is 62 kg. Assume that the foot is a single rigid body, no other ankle musculature is active and the system is static. NOTE: All angles are reported relative to the right horizontal. Complete the free-body diagram of the foot shown below. a. What is the net horizontal talocrural joint reaction force? b. What is the net vertical talocrural joint reaction force? c. What is the magnitude of resultant taloCTural joint reaction force? d. What is the orientation of the resultant talocrural joint reaction force relative to the right horizontal?

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.78P: The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016,...

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Concept explainers

Clutches, Brakes, Couplings, and Flywheels

The clutch is described as a machine element used to connect or disconnect two shafts together to transmit torque or power. The clutch works on the principles of friction. The clutch is commonly used in automobiles to transfer power from the driving shaft to the driven shaft.

Question

During the push-off phase of a running stride the ground reaction force under the 1* metatarsal
was measured to be 900.95 N at 30°. At this instant the triceps surae (gastrocnemius-soleus
complex) is pulling on the calcaneus with a force of 1,222.75 N at an angle of 65°, and the
tibialis anterior muscle is pulling with a force of 484.33 N at an angle of 60° on the medial
cuneiform bone. The mass of the runner is 62 kg. Assume that the foot is a single rigid body, no
other ankle musculature is active and the system is static. NOTE: All angles are reported
relative to the right horizontal. Complete the free-body diagram of the foot shown below.
a. What is the net horizontal talocrural joint reaction force?
b. What is the net vertical talocrural joint reaction force?
c. What is the magnitude of resultant talocnural joint reaction force?
d. What is the orientation of the resultant țalocrural joint reaction force relative to the
right horizontal?

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