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College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs
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Solved: (a) What is the maximum frictional force in the

Chapter 5, Problem 3

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QUESTION:

Problem 3PE

(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? (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? The frictional forces in joints are relatively small in all circumstances except when the joints deteriorate, such as from injury or arthritis. Increased frictional forces can cause further damage and pain.

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QUESTION:

Problem 3PE

(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? (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? The frictional forces in joints are relatively small in all circumstances except when the joints deteriorate, such as from injury or arthritis. Increased frictional forces can cause further damage and pain.

ANSWER:

Part (a)

Step 1 of 6:

A person’s weight is usually supported by the knee joint. The mass of the person is given. We are going to find the maximum frictional force in the knee joint. The static frictional coefficients of the bone lubricated by synovial fluids are constant. We are going to find the maximum frictional force in the knee joint.

The mass of the person

The acceleration due to gravity

The coefficient of static friction

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