College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Chapter 9, Problem 14CQ
Explain why the forces in our joints are several times larger than the forces we on the outside with our limbs. Can these fortes be even greater than muscle forces?
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Chapter 9 Solutions
College Physics
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- A hand exerts a force of 25 lbs on a scale at 16 inches from the joint center at the elbow. If the triceps attach to the ulna at a 90° angle and at a distance of 2.5 cm from the elbow joint center, and if the weight of the forearm and hand is 12 lbs with the hand/forearm CG located 15 cm from the elbow joint center, how much force is being exerted by the triceps? 880 1488 N 8800 O 15.640 N Onone of the answers are correctarrow_forwardDuring most of the stance phase of the gait, the knee flexion is less than 20º. What force must the quadriceps muscle apply to maintain this flexion while standing on one leg? The patient's weight is 836N, assuming that the distance from the center of the joint to the line of gravity is 5 cm and the distance perpendicular to the center of the joint towards which the muscle acts is 5 cm, and the muscle acts ( pull) at 60º to the horizontal.arrow_forwardIf the elbow was flexed to 135°, would the internal force required by the biceps brachii be greater than or less than the force when the elbow was flexed to 90°? Why?arrow_forward
- i need the answer quicklyarrow_forwardHold your upper arm vertical and your lower arm horizontal with your hand palm-down on a table, as shown below. If you now push down on the table, you'll feel that your triceps muscle has contracted and is trying to pivot your lower arm about the elbow joint. If a person with the arm dimensions shown pushes down hard with a 12-lbs force, what force must the triceps muscle provide, in Ibs? Ignore the mass of the arm and hand in your calculation. (Hint: Where should you choose as the pivot point?) Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement. Triceps 30 cm 2.4 cmarrow_forwardA person bending forward to lift a load "with his back" (Figure a) rather than with his knees" can be injured by large forces exerted on the muscles and vertebrae. The spine pivots mainly at the fifth lumbar vertebra, with the principal supporting force provided by the erector spinalis muscle in the back. To see the magnitude of the forces involved, and to understand why back problems are common among humans, consider the model shown in Figure b, of a person bending forward to lift a W-195-N object. The spine and upper body are represented as a uniform horizontal rod of weight W-295 N pivoted at the base of the spine. The erector spinalls muscle, attached at a point two-thirds of the way up the spine, maintains the position of the back. The angle between the spine and this muscle is 12.0° Back muscle Pivot R₂ T120 T W W₂ 0 (a) Find the tension in the back muscle. KN D (b) Find the compressional force in the spine. (Enter the magnitude.) KNarrow_forward
- Unlike most of the other muscles in our bodies, the masseter muscle in the jaw, as illustrated in the figure, is attached relatively far from the joint, enabling very large forces to be exerted by the back teeth. This is shown in the figure below, where a person is biting down on a bullet placed between the back teeth. (FM= 210 N and rR = 4.1 cm.) (a) Using the information in the figure, calculate the magnitude of the force exerted by the teeth on the bullet. (b) Calculate magnitude of the force on the joint.arrow_forwardWhen you carry a heavy load with one arm, why do you tend to hold your free arm away from your body?arrow_forwardConsider the person lifting a heavy box with his back, shown in Figure,The mass of the upper body is 55.0 kg and the mass of the box is 30.0 kg.Calculate the magnitude of the force FB –in the back muscles that is needed to support the upper body plus the box and compare this with his weight.arrow_forward
- Unlike most of the other muscles in our bodies, the masseter muscle in the jaw, as illustrated in the figure, is attached relatively far from the joint, enabling very large forces to be exerted by the back teeth. This is shown in the figure below, where a person is biting down on a bullet placed between the back teeth. (FM = 295 N and rR = 4.0 cm.) (a) Using the information in the figure, calculate the magnitude of the force exerted by the teeth on the bullet._________ N(b) Calculate magnitude of the force on the joint._________ Narrow_forwardIf 25 kg is the maximum mass m that a person can hold in a hand when the arm is positioned with a 105° angle at the elbow as shown in the figure below, what is the maximum force, FM, that the biceps muscle exerts on the forearm? Assume the forearm and hand have a total mass of 2.0 kg with a CG that is 15 cm from the elbow, and that the biceps muscle attaches 5.0 cm from the elbow. (please include given and explain step by step) E 105° max 5.0 cm 15 cm 25 kg (2.0 kg)g -35 cmarrow_forwardApproximately what magnitude force, FM, must the extensor muscle in the upper arm exert on the lower arm to hold a 4.3-kg shot put (Figure 1)? Assume the lower arm has a mass of 3.0 kg and its CG is 13 cm from the elbow-joint pivot.arrow_forward
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