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The necessary reaction force is provided by friction.
Friction causes undesirable wear and tear and destructive heating of contact surfaces.
Both nature and engineers try to maximize and minimize the amount of friction.
Introducing a fluid such as oil at the interface of two surfaces greatly reduces Friction.
The fluid smooths out the surfaces.
The joints of animals are lubricated by a fluid called the synovial fluid.
A factor of 100 is how much the lubricant reduces the coefficient of friction.
Nature provides very efficient joint lubrication.
Steel on ice has a higher coefficient of friction.
There are a few examples of the effects of friction.
Assume that she is wearing leather-soled shoes and standing in a vertical position as shown in the figure.
A person standing on an incline.
The forces acting on the joints are large.
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