EBK BASIC BIOMECHANICS
7th Edition
ISBN: 9780100409453
Author: Hall
Publisher: YUZU
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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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Two lifter's knees are of interest at a specific moment in their lifts. In both lifts,
the knee extensor torque is 100 Nm, requiring quadriceps tendon/patella
ligament forces of 1000 N (about 220 Ibs). Despite equivalent knee torques and
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Briefly explain why.
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How much force must be produced by the biceps brachii, attaching at 90? to the radius
at 3 cm from the center of rotation at the elbow joint, to support a weight of 200 N held
in the hand at a distance of 30 cm from the elbow joint? (Neglect the weight of the
forearm and hand, and neglect any action of other muscles)
If your biceps brachii muscle attaches to your forearm 2 inches below your elbow, the distance from the elbow to the palm of your hand is 18 inches, and you lift a 20 pound weight, how much pull must your muscle exert to achieve elbow flexion? If your biceps brachii muscle attaches to your forearm 2 inches below your elbow, the distance from the elbow to the palm of your hand is 18 inches, and you lift a 20 pound weight, how much pull must your muscle exert to achieve elbow flexion?
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Chapter 4 Solutions
EBK BASIC BIOMECHANICS
Ch. 4 - Prob. 1IPCh. 4 - Prob. 2IPCh. 4 - Prob. 3IPCh. 4 - Prob. 4IPCh. 4 - Prob. 5IPCh. 4 - Prob. 6IPCh. 4 - What kinds of fractures are produced only by...Ch. 4 - Prob. 8IPCh. 4 - In Problem 8, how much total stress is present on...Ch. 4 - Why are men less prone than women to vertebral...
Ch. 4 - Hypothesize about the way or ways in which each of...Ch. 4 - Prob. 2APCh. 4 - Prob. 3APCh. 4 - Hypothesize as to the ability of bone to resist...Ch. 4 - How are the bones of birds and fish adapted for...Ch. 4 - Prob. 6APCh. 4 - Hypothesize as to why men are less prone to...Ch. 4 - Prob. 8APCh. 4 - How much compression is exerted on the radius at...Ch. 4 - If the anterior and posterior deltoids both insert...
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- Where 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_forwardThe flexors of the leg include all of the following except the: Question 29 options: biceps femoris rectus femoris semimenbranosus semitendinosus saritorius Question 30 The muscle fiber arrangement of the rectus femoris is: Question 30 options: bipennate and has greater potential for force bipennate and creates tension through a greater range fusiform and creates tension through a greater range fusiform and has greater potential for force.arrow_forwardAn isometric exercise is one in which the joint angle does not change during the application of muscle force. For instance, you can join your hands together, pushing down with one hand and pushing up with the other. In each arm, the muscles that provide the force are connected to the bones of the arm by tendons. If you increase the forces but keep the angles the same, the muscles will still contract. Explain how this is possible.arrow_forward
- Based 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_forwardA patient is completing a knee extension exercise. The patellar tendon inserts on the tibia 2.92 cm away from the knee joint axis of rotation. The foot is 40.38 cm away from the knee joint axis of rotation. What is the foots arc length through the exercise if the patellar tendon insertion moves through an arc length of 7.80 cm? Report you answer in meters.arrow_forwardKeeping the object you are carrying close to your body reduces the force and stress on your spine. Which one of the five Ls of lifting is this an example of?arrow_forward
- Which of these increases force production? 1. Increasing the velocity of the concentric contraction 2. Increasing the velocity of the eccentric contraction 3. Increasing strength of neural stimulation 4. Holding your breath during contraction 5. Increasing frequency of neural stimulation 6. Decreasing the velocity of the concentric contraction 7. Starting the contraction with the joint in full extension 8. Decreasing the velocity of the eccentric contractionarrow_forwardney: Load (L) = 5 kgs = Effort E = Fulcrum Weight of forearm = 1.8 kgs L = Load Biceps brachii muscle Distance of load from elbow joint = 35 cm %3D Effort (E) = contraction of biceps brachii Distance of center of mass of forearm from elbow = 17 cm Distance of tendon from elbow = 4 cm A) Draw the free-body diagram to represent the forces and moments Load (L) = weight of object plus forearm B) Write the torque equation for static equilibrium Fulcrum (F) = elbow jointarrow_forwardAnalyze the Barbell press (overhead or military press) exercise by breaking the exercise into a lifting phase and lowering phase. For each phase, match the joint movements occurring and then match the force causing movement (muscle or gravity), the force resisting movement (muscle or gravity) and the functional muscle group, type of contraction with each joint for the respective phase. Lifting phase - Elbow - Movement occurring Lifting phase - Elbow - Force causing movement Lifting phase - Elbow - Force resisting movement Lifting phase - Elbow - Functional muscle group, type of contraction Lifting phase - Glenohumeral - Movement occurring Lifting phase - Glenohumeral - Force causing movement Lifting phase - Glenohumeral - Force resisting movement Lifting phase - Glenohumeral - Functional muscle group, type of contraction Lifting phase - Shoulder girdle - Movement occurring Lifting phase - Shoulder girdle - Force causing movement Lifting phase -…arrow_forward
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