BASIC BIOMECHANICS
8th Edition
ISBN: 9781259913877
Author: Hall
Publisher: RENT MCG
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Chapter 13, Problem 9AP
A therapist applies a lateral force of 80 N to the forearm at a distance of 25 cm from the axis of rotation at the elbow. The biceps attaches to the radius at a 90° angle and at a distance of 3 cm from the elbow joint center.
a. How much force is required of the biceps to stabilize the arm in this position?
b. What is the magnitude of the reaction force exerted by the humerus on the ulna? (Answers: a. 666.7 N; b. 586.7 N)
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Students have asked these similar questions
If an individual does training with only the right knee extensor muscles, it is common to see increase in strength in knee extension force for the right leg and an increase in strength in the knee extension force of the left leg (although the increase in force is typically not to the same extent as the force increase in the right leg)
a.) True
b.) False
To answer the following questions utilize the attached picture.
A. What muscles are acting on the knee from B to C?
B. What classification of lever is being demonstrated in this exercise?
C. Where is the resistance occurring?
D. Where is the point of force application at the knee?
E. Utilizing the rules of the lever system, how can this exercise be made easier? (You can’t simply remove the cuff)
Look at the elbow joint x-ray. Why is 90° the optimal joint angle for
biceps activation? What would happen during flexion/extension?
Chapter 13 Solutions
BASIC BIOMECHANICS
Ch. 13 - Why does a force directed through an axis of...Ch. 13 - Why does the orientation of a force acting on a...Ch. 13 - A 23-kg boy sits 1.5 m from the axis of rotation...Ch. 13 - Prob. 4IPCh. 13 - Two people push on opposite sides of a swinging...Ch. 13 - Prob. 6IPCh. 13 - Prob. 7IPCh. 13 - Prob. 8IPCh. 13 - A 10-kg block sits motionless on a table in spite...Ch. 13 - Prob. 10IP
Ch. 13 - A 35-N hand and forearm are held at a 45 angle to...Ch. 13 - A hand exerts a force of 90 N on a scale at 32 cm...Ch. 13 - A patient rehabilitating a knee injury performs...Ch. 13 - A worker leans over and picks up a 90-N box at a...Ch. 13 - A man carries a 3 m, 32-N board over his shoulder....Ch. 13 - A therapist applies a lateral force of 80 N to the...Ch. 13 - Tendon forces Ta and Tb are exerted on the...
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- Active range of motion exercise means another person moves each joint to the patient a. False b. Truearrow_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_forwardHow 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)arrow_forward
- During a Physical Education class, you ask your students to perform a standing vertical jump. Identify the type of muscle contraction involved in the jump and describe the movement patterns of the concentric and eccentric phases. Outline the agonists, antagonists and synergist muscles, which contribute to maximum jump height. Identify the major lower body joints and joint movements, which contribute to the concentric phase of the jump.arrow_forwardWhat is the joint movement at the tibiofemoral (knee) joint? What type of contraction that is controlling this joint movement? What muscles are controlling the tibiofemoral (knee) joint movement?arrow_forwardYou are observing a doctor performing the ballard scoring. As a student nurse you know that if the doctor bilaterally flex the elbows up hold about 5 seconds, then extend arms down next to side and release then observe elbow angle and movement pull back of the arm is of which neuromuscular maturity? a. Square window b. Scarf sign c. Popliteal angle d. Arm recoilarrow_forward
- Which of the following can be used as a treatment for a stitch in the side? Select one: a. Doing jumping jacks b. Trunk rotation c. Extending the trunk d. Flexing the trunkarrow_forwardTo do Right shoulder abduction – A24 in the frontal plane, the (muscle) would have to lie (A – Where?) relative to the joint, and since it can only (B ), the fibers would have to run (C ) to the (D ) axis to achieve the desired movement. choose from: A. Pick from: Anterior, Posterior, Medial, Lateral, Superior, Inferior B. Write in the word “PULL” C. Write “perpendicular” D. Pick from :Anterior - posterior, Superior-inferior or Medio - Lateralarrow_forwardTo do Left elbow supination in the Horizontal plane, the ( name the muscle ) would have to lie (A – Where?) relative to the joint, and since it can only (PULL), the fibers would have to run (PERPENDICULAR ) to the (D ) axis to achieve the desired movement. choose from: A. Pick from: Anterior, Posterior, Medial, Lateral, Superior, Inferior B. Write in the word “PULL” C. Write “perpendicular” D. Pick from :Anterior - posterior, Superior-inferior or Medio - Lateral Example:arrow_forward
- Look at the elbow joint x-ray. Why is 90° the optimal joint angle for biceps activation? What would happen during flexion/extension? Explain in detail !arrow_forwardDescribe the movement in the sagittal plane for knee and hip in relation to the jump task in the plot.arrow_forwardTwo 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 quadriceps forces, patellofemoral joint forces are higher on the knees of lifter A. Briefly explain why. Edit View Insert Format Tools Table 12pt v Paragraph v BIUAarrow_forward
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