What is the maximum frictional force in the knee joint of a person who supports

Question

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 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.

a. 1.6 N

b. 10 N

c. 16 N

Static friction Kinetic friction System Rubber on dry concrete Rubber on wet concrete Wood on wood Waxed wood on wet snow Metal on wood Steel on steel (dry Steel on steel (oiled) Teflon on steel Bone lubricated by synovial fluid Shoes on wood Shoes on ice Ice on ice Steel on ice 1.0 0.7 0.5 0.14 0.5 0.6 0.05 0.04 0.016 0.9 0.1 0.1 0.4 0.7 0.5 0.3 0.1 0.3 0.3 0.03 0.04 0.015 0.7 0.05 0.03 0.02

Explanation / Answer

Ans weight supported bythe knee=m*g=66*9.81=647.46 N

maximum frictional will be at static condition

Fmax=u(static)*normal force

=0.016*647.46=10.359 N

option (b) is correct

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