Leigh is doing a knee extension exercise using a 100 N weight strapped to her ankle...
Leigh is doing a knee extension exercise using a 100 N weight strapped to her ankle 40 cm from her knee joint. She holds her leg so that the horizontal distance from her knee joint to the weight is 30 cm.
1) What is the moment arm of the weight about the knee joint axis?
2) For this position, what torque is created by the ankle weight about her knee joint axis?
3) If the moment arm of the knee extensor muscles is 4 cm about the knee joint axis, what amount of force must these muscles produce to hold the leg in the position described? Consider that in addition to the added weight at the ankle, the leg itself weighs 10kg, and the center of mass of the leg (shown by the crosshair circle in the figure) is located at a distance of 10 cm from the knee joint axis.
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Leigh is doing a knee extension exercise using a 100 N weight
strapped to her ankle...
PROBLEM 2 Knee Extension - The angular motion of the lower leg about the knee joint,...
PROBLEM 2 Knee Extension - The angular motion of the lower leg about the knee joint, and the forces and torques produced by the muscles crossing the knee joint during knee flexions and extensions have been investigated by a number of researchers utilizing different experimental techniques. One of these techniques is discussed here. Consider the person illustrated in Fig. 10.12. The test subject is sitting on a table, with the back placed against a back rest and the lower legs...
KIN 3112 Homework #3 Perform a dynamic analysis for a knee extension movement. The knee extensors...
KIN 3112 Homework #3 Perform a dynamic analysis for a knee extension movement. The knee extensors insert on the tibia at an angle 0-30° and at a distance d-5.2 cm from the axis of rotation of the knee. The combined weight of lower leg and foot is F 48 N and its center of mass is r 0.27 m away from the knee joint axis. The joint angle with respect to the left horizontal is A-70 (Note: this is not...
A person is doing leg flexion/extension exercises from a sitting position in order to strengthen the...
A person is doing leg flexion/extension exercises from a sitting
position in order to strengthen the person's quadracept muscles.
The forces acting in the lower leg are illustrated in the figures
below.
W0 is the weight of the boot, W1 = 160 N
is the weight of the person's lower leg, FM is the
magnitude of the force exerted by the quadricepts muscle on the
tibia (shinbone) through the patellar tendon, and FJ is
the force due to the tibiofemoral...
An ACL patient is doing leg extensions to strengthen his quadriceps muscles. With no additional weight...
An ACL patient is doing leg extensions to strengthen his quadriceps muscles. With no additional weight added, the patient's lower leg (shank+foot) has a mass of 6.25 kg. The center of mass of the lower leg segment is located 32 cm from the axis of rotation of the knee joint. The leg is flexed 25 degree down from horizontal. The quadriceps muscle acts through the patellar tendon, which inserts 5 cm from the axis of rotation of the knee joint...
1. The moment of inertia (sometimes referred to as a “swing weight”) is a measure of...
1. The moment of inertia (sometimes referred to as a “swing weight”) is a measure of the resistance to rotation about a particular axis. It is often expressed as Ia = mka2 where m is the mass of the object and ka is the radius of gyration about the axis of rotation. The radius of gyration ka for the arm about its COM = 0.368*(arm length). Compute the moment of inertia of the arm in the extended position about its...
A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her...
A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0 below the horizontal. (See the figure (Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 5.75% of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the elbow Part...
2. A person is holding a weight (100 N) in their hand. The weight is a...
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Matching 1. Extension Circumduction Plantar flexion 4. Dorsiflexion 5. Eversion 6. Adduction 7. Hyperextension opment term...
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Definitions and Equations: Moment of Inertia (D): Tendency to resist angular acceleration; the angular equivalent of...
Definitions and Equations: Moment of Inertia (D): Tendency to resist angular acceleration; the angular equivalent of mass. In practical terms it is a measure of how hard it is to rotate an object or segment, like a baseball bat or a body segment. It is the sum of the products of the mass (m) with the square of its distance from the axis of rotation (ka). SEE FINAL TWO PAGES OF THIS LAB EOR CHARTS NEEDED TO CALCULATE L. 1...
Procedure 1, 2, 3 Mass of a clamp: 21.5 True mass of meter stick: _133.6 g...
Procedure 1, 2, 3 Mass of a clamp: 21.5 True mass of meter stick: _133.6 g Center of mass of meter stick: _50 cm True weight of unknown mass: _212.99_ Procedure 4 Position of the 100-g mass: 10.0 cm Position of equilibrium: _30.9 cm Mass of the stick from method of torques: Procedure 5 Position of the 100-g mass: 10.0 cm Position of the 200-g mass: _90.0 cm Position of equilibrium of meter stick: Procedure 6 Position of unknown mass...
PROBLEM 2 Knee Extension - The angular motion of the lower leg about the knee joint, and the forces and torques produced by the muscles crossing the knee joint during knee flexions and extensions have been investigated by a number of researchers utilizing different experimental techniques. One of these techniques is discussed here. Consider the person illustrated in Fig. 10.12. The test subject is sitting on a table, with the back placed against a back rest and the lower legs...
KIN 3112 Homework #3 Perform a dynamic analysis for a knee extension movement. The knee extensors insert on the tibia at an angle 0-30° and at a distance d-5.2 cm from the axis of rotation of the knee. The combined weight of lower leg and foot is F 48 N and its center of mass is r 0.27 m away from the knee joint axis. The joint angle with respect to the left horizontal is A-70 (Note: this is not...
A person is doing leg flexion/extension exercises from a sitting
position in order to strengthen the person's quadracept muscles.
The forces acting in the lower leg are illustrated in the figures
below.
W0 is the weight of the boot, W1 = 160 N
is the weight of the person's lower leg, FM is the
magnitude of the force exerted by the quadricepts muscle on the
tibia (shinbone) through the patellar tendon, and FJ is
the force due to the tibiofemoral...
An ACL patient is doing leg extensions to strengthen his quadriceps muscles. With no additional weight added, the patient's lower leg (shank+foot) has a mass of 6.25 kg. The center of mass of the lower leg segment is located 32 cm from the axis of rotation of the knee joint. The leg is flexed 25 degree down from horizontal. The quadriceps muscle acts through the patellar tendon, which inserts 5 cm from the axis of rotation of the knee joint...
A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0 below the horizontal. (See the figure (Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 5.75% of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the elbow Part...
Matching 1. Extension Circumduction Plantar flexion 4. Dorsiflexion 5. Eversion 6. Adduction 7. Hyperextension opment term listed below to its proper definition A Moving the arm so the palm is up B. Moving a body part outward C. Straightening of a body part D. Motion toward the midline of the body E. Moving a body part inward F. Turning a body part around its axis G. A position of maximum extension, or extending a body part beyond its normal limits...
Definitions and Equations: Moment of Inertia (D): Tendency to resist angular acceleration; the angular equivalent of mass. In practical terms it is a measure of how hard it is to rotate an object or segment, like a baseball bat or a body segment. It is the sum of the products of the mass (m) with the square of its distance from the axis of rotation (ka). SEE FINAL TWO PAGES OF THIS LAB EOR CHARTS NEEDED TO CALCULATE L. 1...
Procedure 1, 2, 3 Mass of a clamp: 21.5 True mass of meter stick: _133.6 g Center of mass of meter stick: _50 cm True weight of unknown mass: _212.99_ Procedure 4 Position of the 100-g mass: 10.0 cm Position of equilibrium: _30.9 cm Mass of the stick from method of torques: Procedure 5 Position of the 100-g mass: 10.0 cm Position of the 200-g mass: _90.0 cm Position of equilibrium of meter stick: Procedure 6 Position of unknown mass...
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