BASIC BIOMECHANICS
8th Edition
ISBN: 9781259913877
Author: Hall
Publisher: RENT MCG
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Chapter 6, Problem 8AP
If the biceps brachii, attaching to the radius 2.5 cm from the elbow joint, produces 250 N of tension perpendicular to the bone, and the triceps brachii, attaching 3 cm away from the elbow joint, exerts 200 N of tension perpendicular to the bone, how much net torque is present at the joint? Will there be flexion, extension, or no movement at the joint? (Answer: 0.25 N-m; flexion)
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How much force must be produced by the biceps brachii, attaching at 90? to the radius
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STATIC EQUILIBRIUM EQUATIONS
CONSIDERING ONLY THE DELTOID MUSCLE
Fo
MA =
18 Cn
COR
B=55".
0-30°
RaF 30 cm
FG = 24 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 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< 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_forward2. a) Label the system provided below, including the reference frame, moment arms and vector forces with the information provided. Internal moment arm = 4cm +0.04m External moment arm relative to the segment weight = 25cm 0.25m External moment arm relative to the load weight = 45cm 40.45m Segment weight = 50 N Load weight = 100 N Lower leg segment angle relative to horizontal plane = 45° Quadriceps tendon angle = 45° Axis of rotation MF SW LW 2b) Using the figure in 2a., calculate the external torque of the system relative to the normal component of segment and load weights listed above. 2c) Calculate the amount of both the tangential component of the muscle force and the muscle force itself required to keep this system in a state of static equilibrium.arrow_forward
- 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? hhharrow_forwardGIVE 3 EXERCISES THAT CAN BE CONSIDERED AS A LOCOMOTOR MOVEMENT WITH LATERAL ROTATION AND MEDIAL ROTATION MOVEMENT AND WHY?arrow_forwardGIVE 3 EXERCISES THAT CAN BE CONSIDERED AS A LOCOMOTOR MOVEMENT WITH ABDUCTION AND ADDUCTION MOVEMENT. WHY?arrow_forward
- The 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_forwardA) Describe the difference between strength and power during a squat. Provide a quantitative example that illustrates the difference. B) During a squat, the weight you have on your shoulders has a certain amount of gravitational potential energy. As you squat down and come to a stop at the bottom of the squat, some of that energy is lost. Where does it go?arrow_forwardIs there a difference in the time to fatigue of the dominant and non-dominant arm? Cite relevant experimental data.arrow_forward
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