Whether both types of coefficient of friction are dimensionless and explain why.

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Chapter 7A, Problem 7PLA

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Whether both types of coefficient of friction are dimensionless and explain why.

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Which statement about kinetic friction and static friction is true? (Some of the options mention a horizontal force that friction opposes. This means that a force is pulling horizontally and friction is acting in the opposite direction.) Your answer: The force of kinetic friction changes if the speed of the object decreases. The force of kinetic friction changes if the horizontal force (or forces) it opposes gets weaker. The force of static friction changes if the speed of the object decreases. The force of static friction changes if O the horizontal force (or forces) it opposes gets weaker.

In about 1915, Henry Sincosky of Philadelphia suspended himself from a rafter by gripping the rafter with the thumb of each hand on one side and the fingers on the other side (see the figure). Sincosky's mass was 79.0 kg. If the coefficient of static friction between hand and rafter was 0.720, what was the least magnitude of the normal force on the rafter from each thumb or opposite fingers?

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