BASIC BIOMECHANICS
8th Edition
ISBN: 9781259913877
Author: Hall
Publisher: RENT MCG
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Chapter 4, Problem 10AP
If the anterior and posterior deltoids both insert at an angle of 60° on the humerus and each muscle produces a force of 100 N, how much force is acting perpendicular to the humerus? (Answer: 173.2 N)
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Chapter 4 Solutions
BASIC BIOMECHANICS
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- < The three main forces that act on the patella are shown on the diagram of the knee joint below. These forces are the quadriceps muscle force (FQ), the patella ligament force (FPL), and the patellofemoral joint reaction force (FPF). The angles a and ẞ are with respect to a line that is perpendicular to FPF. Assuming a = 15°, ẞ = 20°, and FQ = 3725 N, use equations for static equilibrium to calculate (a) FPL, and (b) FPF. (Hint: To solve this problem consider using a coordinate system that is aligned with the principal axes of the patella instead of the usual vertical and horizontal axes). (c) Many people assume FQ and FPL are always equal in magnitude but this is only true under certain circumstances. Under what conditions are FQ and FPL equal in magnitude? Fo FPF FP B GriffithUNIVERSITY Queensland Australiaarrow_forwardGIVE 3 EXERCISES THAT CAN BE CONSIDERED AS A LOCOMOTOR MOVEMENT WITH ABDUCTION AND ADDUCTION MOVEMENT. WHY?arrow_forwardMaximal muscle force changes continuously throughout the elbow flexion according to the joint angle. True Falsearrow_forward
- 5 of 10 Which of the following exercises would be an example of a Stabilization-Focused exercise for the shoulders? Standing cable row Bench press Single-leg dumbell overhead press shoulder press machine Next ▶arrow_forwardWhere are the effort, fulcrum, and resistance in the act of dorsiflexion? What class of lever does the foot act as during dorsiflexion? Would you expect it to have a mechanical advantage greater or less than 1.0? Why?arrow_forwardBased on the lever types we identified, are we at an overall mechanical disadvantage or advantage? Meaning, is our athlete working harder to perform less work, or vice versa? Based on the distribution of lever types throughout our lower body, where might we suggest the athlete focus when exerting greater power onto the ball? Joint Joint Action Primary Mover Resistance Lever Type 1. Flexion 1. Iliopsoas 1. 3rd 2. Extension 2. Gluteus Maximus Weight of leg and 2. 3rd ball Hip 3. Internal Rotation 3. Gracilis 3. 3rd 4. Horizontal 4. Pectineus 4. 3rd Adduction 5. Adductor Longus Weight of lower leg and ball Knee 1. Extension 1. Rectus femoris 1.3rd 1. Plantar Flexion 1. Gastrocnemius Weight of foot 1. 1st Ankle 2. Eversion 2. Peroneus Longus and ball 2.3rdarrow_forward
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