(a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee? The coefficient of static friction between the bone and synovial fluid is 0.016 and the coefficient of kinetic friction between the bone and synovial fluid is 0.015. Enter to 3 significant figures Maximum frictional force in the knee joint N (b) During strenuous exercise it is possible to exert forces to the joints that are easily ten times greater than the weight being supported. What is the maximum force of friction under such conditions? Enter to 3 significant figures Maximum frictional force in the knee joint = N

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter5: Newton's Laws Of Motion
Section: Chapter Questions
Problem 76PQ: Jamal and Dayo are lifting a large chest, weighing 207 lb, by using the two rope handles attached to...
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(a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her
mass on that knee? The coefficient of static friction between the bone and synovial fluid is 0.016 and
the coefficient of kinetic friction between the bone and synovial fluid is 0.015.
Enter to 3 significant figures
Maximum frictional force in the knee joint
✔N
(b) During strenuous exercise it is possible to exert forces to the joints that are easily ten times
greater than the weight being supported. What is the maximum force of friction under such
conditions?
Enter to 3 significant figures
Maximum frictional force in the knee joint =
✔N
Hint: In both parts, the maximum friction is asked. You may assume that the femur and the tibia are
at rest with each other to calculate the upper limit of the friction force.
Reflect: Are the frictional forces large or small? To conclude that a quantity is big or small you need
to compare it with some known quantity. In this problem, what would be a good force to compare
the frictional force with?
You may compare the magnitude to the weight supported by the knee. When can these forces
become significant?
Transcribed Image Text:(a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee? The coefficient of static friction between the bone and synovial fluid is 0.016 and the coefficient of kinetic friction between the bone and synovial fluid is 0.015. Enter to 3 significant figures Maximum frictional force in the knee joint ✔N (b) During strenuous exercise it is possible to exert forces to the joints that are easily ten times greater than the weight being supported. What is the maximum force of friction under such conditions? Enter to 3 significant figures Maximum frictional force in the knee joint = ✔N Hint: In both parts, the maximum friction is asked. You may assume that the femur and the tibia are at rest with each other to calculate the upper limit of the friction force. Reflect: Are the frictional forces large or small? To conclude that a quantity is big or small you need to compare it with some known quantity. In this problem, what would be a good force to compare the frictional force with? You may compare the magnitude to the weight supported by the knee. When can these forces become significant?
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